---
OA_place: publisher
OA_type: diamond
PlanS_conform: '1'
_id: '21160'
abstract:
- lang: eng
text: "Context. AM Canum Venaticorum (AM CVn) stars are ultra-compact binary systems
composed of a white dwarf primary accreting from a hydrogen-deficient donor. They
play a crucial role in astrophysics as potential progenitors of Type Ia supernovae
and as laboratories for gravitational wave studies. However, their formation and
evolutionary history remain incomplete. Three formation channels have been discussed
in the literature: the white dwarf, He-star, and cataclysmic variable channels.\r\n\r\nAims.
The chemical composition of the accretor atmosphere reflects the material transferred
from the donor. In this work we took the first accurate measurements of the fundamental
parameters of the accreting white dwarf in ZTF J225237.05−051917.4, including
the abundances of key elements such as carbon, nitrogen, and silicon, by analysing
ultraviolet spectra obtained with the Hubble Space Telescope (HST). These measurements
provide new insight into the evolutionary history of the system and, together
with existing optical observations, establish it as a benchmark to develop our
pipeline, paving the way for its application to a larger sample of AM CVn systems.\r\n\r\nMethods.
We determined the binary parameters through photometric analysis and constrained
the atmospheric parameters of the white dwarf accretor, including its effective
temperature, surface gravity, and chemical abundances, by fitting the HST ultraviolet
spectrum with synthetic spectral models. We then inferred the system’s formation
channel by comparing the results with theoretical evolutionary models.\r\n\r\nResults.
According to our measurements, the accretor’s effective temperature (Teff) is
23 300 ± 600 K and the surface gravity (log g) is 8.4 ± 0.3, which imply an accretor
mass (MWD) of 0.86 ± 0.16 M⊙. We find a high nitrogen-to-carbon abundance ratio
by mass of > 153.\r\n\r\nConclusions. The accretor is significantly hotter than
previous estimates based on simplified blackbody fits to the spectral energy distribution,
underscoring the importance of detailed spectral modelling for accurately determining
system parameters. Our results show that ultraviolet spectroscopy is well suited
to constraining the formation channels of AM CVn systems. Of the three proposed
formation channels, the He-star channel can be excluded given the high nitrogen-to-carbon
ratio. Our results are consistent with both the white dwarf and cataclysmic variable
channels."
acknowledgement: "We thank Lars Bildsten for valuable insights and discussions. We
acknowledge with thanks the variable star observations from the\r\nAAVSO International
Database contributed by observers worldwide and used in this research. We thank
the members of the Spanish Observers of Supernovae\r\n(ObSN) group for their valuable
photometric contributions. This research was\r\nsupported by Deutsche Forschungsgemeinschaft
(DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC 2121
“Quantum Universe”\r\n– 390833306. Co-funded by the European Union (ERC, CompactBINARIES,\r\n101078773).
Views and opinions expressed are however those of the author(s)\r\nonly and do not
necessarily reflect those of the European Union or the European Research Council.
Neither the European Union nor the granting authority\r\ncan be held responsible
for them. DB acknowledges support from the São Paulo\r\nResearch Foundation (FAPESP),
Brazil, Process Numbers #2024/03736-2 and\r\n#2025/00817-4. MRS is supported by
Fondecyt (grant 1221059). MJG acknowledges support from the European Research Council
through ERC Advanced\r\nGrant No. 101054731, from the National Aeronautics and Space
Administration under grants 80NSSC24K0436, 80NSSC22K0479, and 80NSSC24K0380,\r\nand
from the National Science Foundation under grant AST-2205736. PJG\r\nis supported
by NRF SARChI grant 111692. PR-G acknowledges support by\r\nthe Agencia Estatal
de Investigación del Ministerio de Ciencia e Innovación\r\n(MCIN/AEI) and the European
Regional Development Fund (ERDF) under grant\r\nPID2021–124879NB–I00. DS is supported
by the UK Science and Technology Facilities Council (STFC, grant numbers ST/T007184/1,
ST/T003103/1,\r\nand ST/T000406/1). OT acknowledges Proyectos Internos USM 2025,
PI-LII2025-03. GT was supported by grants IN109723 from the Programa de Apoyo a\r\nProyectos
de Investigación e Innovación Tecnológica (PAPIIT). This project has\r\nreceived
funding from the European Research Council (ERC) under the European Union’s Horizon
2020 research and innovation programme (Grant agreement No. 101020057)."
article_number: A14
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: W.
full_name: Yu, W.
last_name: Yu
- first_name: A. F.
full_name: Pala, A. F.
last_name: Pala
- first_name: T.
full_name: Kupfer, T.
last_name: Kupfer
- first_name: B. T.
full_name: Gänsicke, B. T.
last_name: Gänsicke
- first_name: D.
full_name: Koester, D.
last_name: Koester
- first_name: D.
full_name: Belloni, D.
last_name: Belloni
- first_name: T. L.S.
full_name: Wong, T. L.S.
last_name: Wong
- first_name: M. R.
full_name: Schreiber, M. R.
last_name: Schreiber
- first_name: Joannes C
full_name: van Roestel, Joannes C
id: 4d122fc8-6083-11f0-87a5-97d68b860333
last_name: van Roestel
- first_name: A. J.
full_name: Brown, A. J.
last_name: Brown
- first_name: E. O.
full_name: Waagen, E. O.
last_name: Waagen
- first_name: J. L.
full_name: González-Carballo, J. L.
last_name: González-Carballo
- first_name: S.
full_name: Bednarz, S.
last_name: Bednarz
- first_name: K.
full_name: Bernacki, K.
last_name: Bernacki
- first_name: D.
full_name: De Martino, D.
last_name: De Martino
- first_name: E.
full_name: Fernández Mañanes, E.
last_name: Fernández Mañanes
- first_name: R.
full_name: González Farfán, R.
last_name: González Farfán
- first_name: M. J.
full_name: Green, M. J.
last_name: Green
- first_name: P. J.
full_name: Groot, P. J.
last_name: Groot
- first_name: F. J.
full_name: Hambsch, F. J.
last_name: Hambsch
- first_name: C.
full_name: Knigge, C.
last_name: Knigge
- first_name: J. L.
full_name: Martin-Velasco, J. L.
last_name: Martin-Velasco
- first_name: M.
full_name: Morales-Aimar, M.
last_name: Morales-Aimar
- first_name: G.
full_name: Myers, G.
last_name: Myers
- first_name: R.
full_name: Naves Nogues, R.
last_name: Naves Nogues
- first_name: R.
full_name: Poggiani, R.
last_name: Poggiani
- first_name: A.
full_name: Popowicz, A.
last_name: Popowicz
- first_name: G.
full_name: Ramsay, G.
last_name: Ramsay
- first_name: E.
full_name: Reina-Lorenz, E.
last_name: Reina-Lorenz
- first_name: P.
full_name: Rodríguez-Gil, P.
last_name: Rodríguez-Gil
- first_name: J. L.
full_name: Salto-González, J. L.
last_name: Salto-González
- first_name: E. M.
full_name: Sion, E. M.
last_name: Sion
- first_name: D.
full_name: Steeghs, D.
last_name: Steeghs
- first_name: P.
full_name: Szkody, P.
last_name: Szkody
- first_name: O.
full_name: Toloza, O.
last_name: Toloza
- first_name: G.
full_name: Tovmassian, G.
last_name: Tovmassian
citation:
ama: 'Yu W, Pala AF, Kupfer T, et al. The evolutionary history of ultra-compact
accreting binaries: I. Chemical abundances and the formation channel of the eclipsing
AM CVn system ZTF J225237.05-051917.4 from HST spectroscopy. Astronomy and
Astrophysics. 2026;706. doi:10.1051/0004-6361/202557568'
apa: 'Yu, W., Pala, A. F., Kupfer, T., Gänsicke, B. T., Koester, D., Belloni, D.,
… Tovmassian, G. (2026). The evolutionary history of ultra-compact accreting binaries:
I. Chemical abundances and the formation channel of the eclipsing AM CVn system
ZTF J225237.05-051917.4 from HST spectroscopy. Astronomy and Astrophysics.
EDP Sciences. https://doi.org/10.1051/0004-6361/202557568'
chicago: 'Yu, W., A. F. Pala, T. Kupfer, B. T. Gänsicke, D. Koester, D. Belloni,
T. L.S. Wong, et al. “The Evolutionary History of Ultra-Compact Accreting Binaries:
I. Chemical Abundances and the Formation Channel of the Eclipsing AM CVn System
ZTF J225237.05-051917.4 from HST Spectroscopy.” Astronomy and Astrophysics.
EDP Sciences, 2026. https://doi.org/10.1051/0004-6361/202557568.'
ieee: 'W. Yu et al., “The evolutionary history of ultra-compact accreting
binaries: I. Chemical abundances and the formation channel of the eclipsing AM
CVn system ZTF J225237.05-051917.4 from HST spectroscopy,” Astronomy and Astrophysics,
vol. 706. EDP Sciences, 2026.'
ista: 'Yu W, Pala AF, Kupfer T, Gänsicke BT, Koester D, Belloni D, Wong TLS, Schreiber
MR, van Roestel JC, Brown AJ, Waagen EO, González-Carballo JL, Bednarz S, Bernacki
K, De Martino D, Fernández Mañanes E, González Farfán R, Green MJ, Groot PJ, Hambsch
FJ, Knigge C, Martin-Velasco JL, Morales-Aimar M, Myers G, Naves Nogues R, Poggiani
R, Popowicz A, Ramsay G, Reina-Lorenz E, Rodríguez-Gil P, Salto-González JL, Sion
EM, Steeghs D, Szkody P, Toloza O, Tovmassian G. 2026. The evolutionary history
of ultra-compact accreting binaries: I. Chemical abundances and the formation
channel of the eclipsing AM CVn system ZTF J225237.05-051917.4 from HST spectroscopy.
Astronomy and Astrophysics. 706, A14.'
mla: 'Yu, W., et al. “The Evolutionary History of Ultra-Compact Accreting Binaries:
I. Chemical Abundances and the Formation Channel of the Eclipsing AM CVn System
ZTF J225237.05-051917.4 from HST Spectroscopy.” Astronomy and Astrophysics,
vol. 706, A14, EDP Sciences, 2026, doi:10.1051/0004-6361/202557568.'
short: W. Yu, A.F. Pala, T. Kupfer, B.T. Gänsicke, D. Koester, D. Belloni, T.L.S.
Wong, M.R. Schreiber, J.C. van Roestel, A.J. Brown, E.O. Waagen, J.L. González-Carballo,
S. Bednarz, K. Bernacki, D. De Martino, E. Fernández Mañanes, R. González Farfán,
M.J. Green, P.J. Groot, F.J. Hambsch, C. Knigge, J.L. Martin-Velasco, M. Morales-Aimar,
G. Myers, R. Naves Nogues, R. Poggiani, A. Popowicz, G. Ramsay, E. Reina-Lorenz,
P. Rodríguez-Gil, J.L. Salto-González, E.M. Sion, D. Steeghs, P. Szkody, O. Toloza,
G. Tovmassian, Astronomy and Astrophysics 706 (2026).
date_created: 2026-02-08T23:02:49Z
date_published: 2026-02-01T00:00:00Z
date_updated: 2026-02-16T09:36:24Z
day: '01'
ddc:
- '520'
department:
- _id: IlCa
doi: 10.1051/0004-6361/202557568
external_id:
arxiv:
- '2512.04147'
file:
- access_level: open_access
checksum: 2faec710fd04f927aa43deb57e35c9b2
content_type: application/pdf
creator: dernst
date_created: 2026-02-16T09:33:56Z
date_updated: 2026-02-16T09:33:56Z
file_id: '21227'
file_name: 2026_AstronomyAstrophysics_Yu.pdf
file_size: 4020466
relation: main_file
success: 1
file_date_updated: 2026-02-16T09:33:56Z
has_accepted_license: '1'
intvolume: ' 706'
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
publication: Astronomy and Astrophysics
publication_identifier:
eissn:
- 1432-0746
issn:
- 0004-6361
publication_status: published
publisher: EDP Sciences
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'The evolutionary history of ultra-compact accreting binaries: I. Chemical
abundances and the formation channel of the eclipsing AM CVn system ZTF J225237.05-051917.4
from HST spectroscopy'
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 706
year: '2026'
...
---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '21705'
abstract:
- lang: eng
text: "We report the discovery of ATLAS J101342.5−451656.8 (hereafter ATLAS J1013−4516),
an 8.56 minute orbital-period mass-transferring AM Canum Venaticorum (AM CVn)
binary with a mean Gaia magnitude of G = 19.51, identified via periodic variability
in light curves from the Asteroid Terrestrial-impact Last Alert System (ATLAS)
of Gaia white dwarf candidates. Follow-up with the Large Lenslet Array Magellan
Spectrograph shows a helium-dominated accretion disk, and high-speed ULTRACAM
photometry reveals pronounced primary and secondary eclipses. We construct a decade-long
timing baseline leveraging light curves from the ATLAS and Gaia surveys, as well
as the high-speed imagers ULTRACAM on the New Energy Telescope and proto-Lightspeed
on the Magellan Clay telescope. From this timing baseline, we measure an orbital
period derivative of P 1.60 0.07 10 = ± × 12 s s−1. Interpreted in the context
of stable mass transfer, the magnitude and sign of P indicate that the orbital
evolution is governed by the interplay between gravitationalwave-driven angular-momentum
losses and mass transfer, directly probing the donor’s structural response to
mass loss. We constrain the accretor and donor mass based on stable mass-transfer
arguments assuming angularmomentum loss dominated by gravitational-wave emission,
allowing us to infer the characteristic gravitational\r\nwave strain of the binary
for future space-based GW observatories such as the Laser Interferometer Space
Antenna (LISA). We predict a characteristic strain corresponding to a 4 yr LISA
signal-to-noise ratio ≳10, establishing ATLAS J1013−4516 as a strong prospective
LISA source that will probe long-term orbital evolution in the mass-transferring
regime."
acknowledgement: This work has made use of data from the Asteroid Terrestrial-impact
Last Alert System (ATLAS) project. The Asteroid Terrestrial-impact Last Alert System
(ATLAS) project is primarily funded to search for near-Earth asteroids through NASA
grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575; byproducts of the NEO search
include images and catalogs from the survey area. This work was partially funded
by Kepler/K2 grant J1944/80NSSC19K0112 and HST GO-15889 and STFC grants ST/T000198/1
and ST/S006109/1. The ATLAS science products have been made possible through the
contributions of the University of Hawaii Institute for Astronomy, the Queen’s University
Belfast, the Space Telescope Science Institute, the South African Astronomical Observatory,
and the Millennium Institute of Astrophysics (MAS), Chile. VSD and ULTRACAM are
supported by STFC grant ST/Z000033/1. J.G.M. gratefully acknowledges support from
the Heising-Simons Foundation and the Pappalardo family through the MIT Pappalardo
Fellowship in Physics.
article_number: '237'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Emma T.
full_name: Chickles, Emma T.
last_name: Chickles
- first_name: Joheen
full_name: Chakraborty, Joheen
last_name: Chakraborty
- first_name: Kevin B.
full_name: Burdge, Kevin B.
last_name: Burdge
- first_name: Vik S.
full_name: Dhillon, Vik S.
last_name: Dhillon
- first_name: Paul
full_name: Draghis, Paul
last_name: Draghis
- first_name: Kareem
full_name: El-Badry, Kareem
last_name: El-Badry
- first_name: Matthew J.
full_name: Green, Matthew J.
last_name: Green
- first_name: Aaron
full_name: Householder, Aaron
last_name: Householder
- first_name: Sarah
full_name: Hughes, Sarah
last_name: Hughes
- first_name: Christopher
full_name: Layden, Christopher
last_name: Layden
- first_name: Stuart P.
full_name: Littlefair, Stuart P.
last_name: Littlefair
- first_name: James
full_name: Munday, James
last_name: Munday
- first_name: Ingrid
full_name: Pelisoli, Ingrid
last_name: Pelisoli
- first_name: Maya S.
full_name: Redden, Maya S.
last_name: Redden
- first_name: John
full_name: Tonry, John
last_name: Tonry
- first_name: Joannes C
full_name: van Roestel, Joannes C
id: 4d122fc8-6083-11f0-87a5-97d68b860333
last_name: van Roestel
- first_name: Francesco Elio
full_name: Angile, Francesco Elio
last_name: Angile
- first_name: Alex J.
full_name: Brown, Alex J.
last_name: Brown
- first_name: Noel Castro
full_name: Segura, Noel Castro
last_name: Segura
- first_name: Jack
full_name: Dinsmore, Jack
last_name: Dinsmore
- first_name: Martin
full_name: Dyer, Martin
last_name: Dyer
- first_name: Gabor
full_name: Furesz, Gabor
last_name: Furesz
- first_name: Michelle
full_name: Gabutti, Michelle
last_name: Gabutti
- first_name: James
full_name: Garbutt, James
last_name: Garbutt
- first_name: Juliana
full_name: García-Mejía, Juliana
last_name: García-Mejía
- first_name: Daniel
full_name: Jarvis, Daniel
last_name: Jarvis
- first_name: Mark R.
full_name: Kennedy, Mark R.
last_name: Kennedy
- first_name: Paul
full_name: Kerry, Paul
last_name: Kerry
- first_name: James
full_name: Mccormac, James
last_name: Mccormac
- first_name: Geoffrey
full_name: Mo, Geoffrey
last_name: Mo
- first_name: Dave
full_name: Osip, Dave
last_name: Osip
- first_name: Steven
full_name: Parsons, Steven
last_name: Parsons
- first_name: Eleanor
full_name: Pike, Eleanor
last_name: Pike
- first_name: John J.
full_name: Piotrowski, John J.
last_name: Piotrowski
- first_name: Roger W.
full_name: Romani, Roger W.
last_name: Romani
- first_name: David
full_name: Sahman, David
last_name: Sahman
- first_name: Rob
full_name: Simcoe, Rob
last_name: Simcoe
citation:
ama: Chickles ET, Chakraborty J, Burdge KB, et al. An eclipsing 8.56 minutes orbital
period mass-transferring binary. The Astrophysical Journal. 2026;1000(2).
doi:10.3847/1538-4357/ae4871
apa: Chickles, E. T., Chakraborty, J., Burdge, K. B., Dhillon, V. S., Draghis, P.,
El-Badry, K., … Simcoe, R. (2026). An eclipsing 8.56 minutes orbital period mass-transferring
binary. The Astrophysical Journal. IOP Publishing. https://doi.org/10.3847/1538-4357/ae4871
chicago: Chickles, Emma T., Joheen Chakraborty, Kevin B. Burdge, Vik S. Dhillon,
Paul Draghis, Kareem El-Badry, Matthew J. Green, et al. “An Eclipsing 8.56 Minutes
Orbital Period Mass-Transferring Binary.” The Astrophysical Journal. IOP
Publishing, 2026. https://doi.org/10.3847/1538-4357/ae4871.
ieee: E. T. Chickles et al., “An eclipsing 8.56 minutes orbital period mass-transferring
binary,” The Astrophysical Journal, vol. 1000, no. 2. IOP Publishing, 2026.
ista: Chickles ET, Chakraborty J, Burdge KB, Dhillon VS, Draghis P, El-Badry K,
Green MJ, Householder A, Hughes S, Layden C, Littlefair SP, Munday J, Pelisoli
I, Redden MS, Tonry J, van Roestel JC, Angile FE, Brown AJ, Segura NC, Dinsmore
J, Dyer M, Furesz G, Gabutti M, Garbutt J, García-Mejía J, Jarvis D, Kennedy MR,
Kerry P, Mccormac J, Mo G, Osip D, Parsons S, Pike E, Piotrowski JJ, Romani RW,
Sahman D, Simcoe R. 2026. An eclipsing 8.56 minutes orbital period mass-transferring
binary. The Astrophysical Journal. 1000(2), 237.
mla: Chickles, Emma T., et al. “An Eclipsing 8.56 Minutes Orbital Period Mass-Transferring
Binary.” The Astrophysical Journal, vol. 1000, no. 2, 237, IOP Publishing,
2026, doi:10.3847/1538-4357/ae4871.
short: E.T. Chickles, J. Chakraborty, K.B. Burdge, V.S. Dhillon, P. Draghis, K.
El-Badry, M.J. Green, A. Householder, S. Hughes, C. Layden, S.P. Littlefair, J.
Munday, I. Pelisoli, M.S. Redden, J. Tonry, J.C. van Roestel, F.E. Angile, A.J.
Brown, N.C. Segura, J. Dinsmore, M. Dyer, G. Furesz, M. Gabutti, J. Garbutt, J.
García-Mejía, D. Jarvis, M.R. Kennedy, P. Kerry, J. Mccormac, G. Mo, D. Osip,
S. Parsons, E. Pike, J.J. Piotrowski, R.W. Romani, D. Sahman, R. Simcoe, The Astrophysical
Journal 1000 (2026).
date_created: 2026-04-12T22:01:47Z
date_published: 2026-04-01T00:00:00Z
date_updated: 2026-05-04T06:37:12Z
day: '01'
ddc:
- '520'
department:
- _id: IlCa
doi: 10.3847/1538-4357/ae4871
external_id:
arxiv:
- '2601.07925'
file:
- access_level: open_access
checksum: c8f64a78f36224d8e0ea1f324e43e389
content_type: application/pdf
creator: dernst
date_created: 2026-05-04T06:36:00Z
date_updated: 2026-05-04T06:36:00Z
file_id: '21782'
file_name: 2026_AstrophysicalJournal_Chickles.pdf
file_size: 1225916
relation: main_file
success: 1
file_date_updated: 2026-05-04T06:36:00Z
has_accepted_license: '1'
intvolume: ' 1000'
issue: '2'
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
publication: The Astrophysical Journal
publication_identifier:
eissn:
- 1538-4357
issn:
- 0004-637X
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: An eclipsing 8.56 minutes orbital period mass-transferring binary
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 1000
year: '2026'
...
---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '21780'
abstract:
- lang: eng
text: It is predicted that half or more of all cataclysmic variables (CVs) should
have evolved past the period minimum and now exist as so-called period bouncers
where a white dwarf should be accreting from a Roche lobe filling substellar companion.
However, this prediction stands in stark contrast to observations, where only
a few per cent of CVs are found in this evolutionary phase. A potential solution
to this discrepancy is that a magnetic field emerges from within the white dwarf
after the system has reached the period minimum. The transfer of angular momentum
from the spin of the white dwarf into the orbit then pushes the two stars apart,
detaching them for potentially billions of years. Here we present the discovery
of ZTF J021804.16+071152.93, a detached 0.69 +- 0.01 M, 19 MG magnetic white
dwarf plus 37 +- 5MJup brown dwarf binary with an orbital period of 1.7 h. The
kinematics of the system indicate that it is a high probability member of the
Galactic thick disc. However, this strongly disagrees with the much younger age
of the system obtained from the white dwarf parameters, implying that the system
may have been accreting in the past. This system is therefore consistent with
having detached as a result of the emergence of the magnetic field of the white
dwarf when the system was still mass transferring, and may represent the ultimate
fate for many (perhaps even most) CVs.
acknowledgement: "The results presented in this paper are based on observations collected
at the European Southern Observatory under programme IDs 113.D-0277 and 114.D-0066
and on observations made with the Gran Telescopio Canarias (programme ID GTC119-23B),
installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto
de Astrofísica de Canarias, on the island of La Palma.\r\n\r\nSGP acknowledges support
by the Science and Technology Facilities Council (grant ST/B001174/1). ARM acknowledges
support from MINECO under the PID2023-148661NB-I00 grant and by the AGAUR/Generalitat
de Catalunya grant SGR-386/2021. RMO was funded by INTA through grant PRE-OBSERVATORIO
and acknowledges support from project PID2023-146210NB-I00 funded by MICIU/AEI/10.13039/501100011033
and by ERDF/EU. MZ acknowledges support from FONDECYT (grants 1250525 and 1221059).
VSD and HiPERCAM were funded by the Science and Technology Facilities Council (grant
ST/Z000033/1). MRS thanks for support from FONDECYT (grant No. 1221059). This project
received funding from the European Research Council under the European Union’s Horizon
2020 research and innovation programme (Grant agreement numbers 101002408-MOS100PC)."
article_number: stag521
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: S. G.
full_name: Parsons, S. G.
last_name: Parsons
- first_name: A. J.
full_name: Brown, A. J.
last_name: Brown
- first_name: S. L.
full_name: Casewell, S. L.
last_name: Casewell
- first_name: S. P.
full_name: Littlefair, S. P.
last_name: Littlefair
- first_name: Joannes C
full_name: van Roestel, Joannes C
id: 4d122fc8-6083-11f0-87a5-97d68b860333
last_name: van Roestel
- first_name: A.
full_name: Rebassa-Mansergas, A.
last_name: Rebassa-Mansergas
- first_name: R.
full_name: Murillo-Ojeda, R.
last_name: Murillo-Ojeda
- first_name: M.
full_name: Zorotovic, M.
last_name: Zorotovic
- first_name: M. R.
full_name: Schreiber, M. R.
last_name: Schreiber
- first_name: S.
full_name: Bagnulo, S.
last_name: Bagnulo
- first_name: M. A.
full_name: Stroet, M. A.
last_name: Stroet
- first_name: N.
full_name: Castro Segura, N.
last_name: Castro Segura
- first_name: V. S.
full_name: Dhillon, V. S.
last_name: Dhillon
- first_name: M. J.
full_name: Dyer, M. J.
last_name: Dyer
- first_name: J. A.
full_name: Garbutt, J. A.
last_name: Garbutt
- first_name: M. J.
full_name: Green, M. J.
last_name: Green
- first_name: D.
full_name: Jarvis, D.
last_name: Jarvis
- first_name: M. R.
full_name: Kennedy, M. R.
last_name: Kennedy
- first_name: P.
full_name: Kerry, P.
last_name: Kerry
- first_name: J.
full_name: Mccormac, J.
last_name: Mccormac
- first_name: J.
full_name: Munday, J.
last_name: Munday
- first_name: I.
full_name: Pelisoli, I.
last_name: Pelisoli
- first_name: E.
full_name: Pike, E.
last_name: Pike
- first_name: D. I.
full_name: Sahman, D. I.
last_name: Sahman
- first_name: A.
full_name: Yates, A.
last_name: Yates
citation:
ama: 'Parsons SG, Brown AJ, Casewell SL, et al. ZTF J021804.16+071152.93: A dead
cataclysmic variable and potential solution to the missing period bouncer cataclysmic
variables. Monthly Notices of the Royal Astronomical Society. 2026;547(4).
doi:10.1093/mnras/stag521'
apa: 'Parsons, S. G., Brown, A. J., Casewell, S. L., Littlefair, S. P., van Roestel,
J. C., Rebassa-Mansergas, A., … Yates, A. (2026). ZTF J021804.16+071152.93: A
dead cataclysmic variable and potential solution to the missing period bouncer
cataclysmic variables. Monthly Notices of the Royal Astronomical Society.
Oxford University Press. https://doi.org/10.1093/mnras/stag521'
chicago: 'Parsons, S. G., A. J. Brown, S. L. Casewell, S. P. Littlefair, Joannes
C van Roestel, A. Rebassa-Mansergas, R. Murillo-Ojeda, et al. “ZTF J021804.16+071152.93:
A Dead Cataclysmic Variable and Potential Solution to the Missing Period Bouncer
Cataclysmic Variables.” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2026. https://doi.org/10.1093/mnras/stag521.'
ieee: 'S. G. Parsons et al., “ZTF J021804.16+071152.93: A dead cataclysmic
variable and potential solution to the missing period bouncer cataclysmic variables,”
Monthly Notices of the Royal Astronomical Society, vol. 547, no. 4. Oxford
University Press, 2026.'
ista: 'Parsons SG, Brown AJ, Casewell SL, Littlefair SP, van Roestel JC, Rebassa-Mansergas
A, Murillo-Ojeda R, Zorotovic M, Schreiber MR, Bagnulo S, Stroet MA, Castro Segura
N, Dhillon VS, Dyer MJ, Garbutt JA, Green MJ, Jarvis D, Kennedy MR, Kerry P, Mccormac
J, Munday J, Pelisoli I, Pike E, Sahman DI, Yates A. 2026. ZTF J021804.16+071152.93:
A dead cataclysmic variable and potential solution to the missing period bouncer
cataclysmic variables. Monthly Notices of the Royal Astronomical Society. 547(4),
stag521.'
mla: 'Parsons, S. G., et al. “ZTF J021804.16+071152.93: A Dead Cataclysmic Variable
and Potential Solution to the Missing Period Bouncer Cataclysmic Variables.” Monthly
Notices of the Royal Astronomical Society, vol. 547, no. 4, stag521, Oxford
University Press, 2026, doi:10.1093/mnras/stag521.'
short: S.G. Parsons, A.J. Brown, S.L. Casewell, S.P. Littlefair, J.C. van Roestel,
A. Rebassa-Mansergas, R. Murillo-Ojeda, M. Zorotovic, M.R. Schreiber, S. Bagnulo,
M.A. Stroet, N. Castro Segura, V.S. Dhillon, M.J. Dyer, J.A. Garbutt, M.J. Green,
D. Jarvis, M.R. Kennedy, P. Kerry, J. Mccormac, J. Munday, I. Pelisoli, E. Pike,
D.I. Sahman, A. Yates, Monthly Notices of the Royal Astronomical Society 547 (2026).
date_created: 2026-05-03T22:01:37Z
date_published: 2026-04-01T00:00:00Z
date_updated: 2026-05-07T07:51:58Z
day: '01'
ddc:
- '520'
department:
- _id: IlCa
doi: 10.1093/mnras/stag521
external_id:
arxiv:
- '2603.12888'
file:
- access_level: open_access
checksum: a64094199db4dedb12fc121b7c65fe97
content_type: application/pdf
creator: dernst
date_created: 2026-05-07T07:51:06Z
date_updated: 2026-05-07T07:51:06Z
file_id: '21834'
file_name: 2026_MNRAS_Parsons.pdf
file_size: 5955512
relation: main_file
success: 1
file_date_updated: 2026-05-07T07:51:06Z
has_accepted_license: '1'
intvolume: ' 547'
issue: '4'
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'ZTF J021804.16+071152.93: A dead cataclysmic variable and potential solution
to the missing period bouncer cataclysmic variables'
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 547
year: '2026'
...
---
OA_place: publisher
OA_type: hybrid
PlanS_conform: '1'
_id: '21842'
abstract:
- lang: eng
text: "AM CVn stars are ultra-compact semi-detached binaries consisting of a white
dwarf primary and a hydrogen-depleted secondary. In this\r\npaper, we present
spectroscopic and photometric results of 15 transient sources pre-classified as
AM CVn candidates. Our analysis confirms\r\n9 systems of the type AM CVn, 3 hydrogen-rich
cataclysmic variables (accreting white dwarfs with near-main-sequence stars for
donors),\r\nand 3 systems that could be evolved cataclysmic variables. Eight of
the AM CVn stars are analysed spectroscopically for the first time,\r\nwhich increases
the number of spectroscopically confirmed AM CVns by about 10%. TESS data revealed
the orbital period of the AM CVn\r\nstar ASASSN-20pv to be Porb =27.282 min, which
helps to constrain the possible values of its mass ratio. TESS also helped to
determine\r\nthe superhump periods of one AM CVn star (ASASSN-19ct, Psh =30.94
min) and two cataclysmic variables we classify as WZ Sge stars\r\n(Psh =90.77
min for ZTF18aaaasnn and Psh =91.6min for ASASSN-15na).We identified very different
abundances in the spectra of theAM\r\nCVns binaries ASASSN-15kf and ASASSN-20pv
(both Porb ∼27.5min), suggesting different type of donors. Six of the studied
AMCVns are\r\nX-ray sources, which helped to determine their mass accretion rates.
Photometry shows that the duration of all the superoutbursts detected\r\nin the
AM CVns is consistent with expectations from the disc instability model. Finally,
we provide refined criteria for the identification of\r\nnew systems using all-sky
surveys such as LSST."
acknowledgement: "We are grateful to the anonymous referee for providing\r\nus with
useful comments and suggestions that improved our manuscript.\r\nJK and LRS acknowledge
support from NASA grants NNH22ZDA001N-6152\r\nand 80NSSC24K0638. MPM is partially
supported by the Swiss National\r\nScience Foundation IZSTZ0_216537 and by UNAM
PAPIIT-IG101224. Based\r\non observations obtained at the international Gemini Observatory,
a program\r\nof NSF NOIRLab, which is managed by the Association of Universities
for\r\nResearch in Astronomy (AURA) under a cooperative agreement with the U.S.\r\nNational
Science Foundation on behalf of the Gemini Observatory partnership:\r\nthe U.S.
National Science Foundation (United States), National Research\r\nCouncil (Canada),
Agencia Nacional de Investigación y Desarrollo (Chile), Ministerio de Ciencia, Tecnología
e Innovación (Argentina), Ministério\r\nda Ciência, Tecnologia, Inovações e Comunicações
(Brazil), and Korea\r\nAstronomy and Space Science Institute (Republic of Korea).
The Gemini\r\ndata were obtained from programs GN-2023B-Q-310 and GS-2024A-Q-311\r\n(PI:
Rivera Sandoval) and processed using DRAGONS (Data Reduction for\r\nAstronomy from
Gemini Observatory North and South) The Digitized Sky\r\nSurveys were produced at
the Space Telescope Science Institute under U.S.\r\nGovernment grant NAG W-2166.
The images of these surveys are based on\r\nphotographic data obtained using the
Oschin Schmidt Telescope on Palomar\r\nMountain and the UK Schmidt Telescope. The
plates were processed into the\r\npresent compressed digital form with the permission
of these institutions.\r\nThe National Geographic Society – Palomar Observatory
Sky Atlas (POSS-I)\r\nwas made by the California Institute of Technology with grants
from the\r\nNational Geographic Society. The Second Palomar Observatory Sky Survey\r\n(POSS-II)
was made by the California Institute of Technology with funds\r\nfrom the National
Science Foundation, the National Geographic Society, the\r\nSloan Foundation, the
Samuel Oschin Foundation, and the Eastman Kodak\r\nCorporation. The Oschin Schmidt
Telescope is operated by the California\r\nInstitute of Technology and Palomar Observatory.
The UK Schmidt Telescope\r\nwas operated by the Royal Observatory Edinburgh, with
funding from the\r\nUK Science and Engineering Research Council (later the UK Particle
Physics\r\nand Astronomy Research Council), until 1988 June, and thereafter by the\r\nAnglo-Australian
Observatory. The blue plates of the southern Sky Atlas\r\nand its Equatorial Extension
(together known as the SERC-J), as well as the\r\nEquatorial Red (ER), and the Second
Epoch [red] Survey (SES) were all taken\r\nwith the UK Schmidt. Supplemental funding
for sky-survey work at the ST\r\nScI is provided by the European Southern Observatory.
Based on observations\r\nobtained with the Samuel Oschin Telescope 48-inch and the
60-inch Telescope\r\nat the Palomar Observatory as part of the Zwicky Transient
Facility project.\r\nZTF is supported by the National Science Foundation under Grants
No. AST-\r\n1440341 and AST-2034437 and a collaboration including current partners\r\nCaltech,
IPAC, the Oskar Klein Center at Stockholm University, the University\r\nof Maryland,
University of California, Berkeley, the University of Wisconsin\r\nat Milwaukee,
University of Warwick, Ruhr University, Cornell University,\r\nNorthwestern University,
and Drexel University. Operations are conducted\r\nby COO, IPAC, and UW. This work
has used data from the European\r\nSpace Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia),\r\nprocessed
by the Gaia Data Processing and Analysis Consortium (DPAC,\r\nhttps://www.cosmos.esa.int/web/gaia/dpac/consortium).
Funding for the\r\nDPAC has been provided by national institutions, in particular,
the institutions\r\nparticipating in the Gaia Multilateral Agreement. We acknowledge
with\r\nthanks the variable star observations from the AAVSO International Database\r\ncontributed
by observers worldwide and used in this research. This paper\r\nincludes data collected
by the TESS mission. Funding for the TESS mission\r\nis provided by the NASA Science
Mission Directorate. Some of the data\r\npresented in this paper were obtained from
the B. Mikulski Archive for Space\r\nTelescopes (MAST). This research has made use
of the SIMBAD database,\r\noperated at CDS, Strasbourg, France. This research has
made use of ‘Aladin\r\nsky atlas’ developed at CDS, Strasbourg Observatory, France.
This research\r\nhas made use of the VizieR catalogue access tool, CDS, Strasbourg,
France."
article_number: e052
article_processing_charge: Yes (in subscription journal)
article_type: original
author:
- first_name: Jan
full_name: Kára, Jan
last_name: Kára
- first_name: Liliana
full_name: Rivera Sandoval, Liliana
last_name: Rivera Sandoval
- first_name: Wendy
full_name: Mendoza, Wendy
last_name: Mendoza
- first_name: Thomas
full_name: Maccarone, Thomas
last_name: Maccarone
- first_name: Manuel
full_name: Pichardo Marcano, Manuel
last_name: Pichardo Marcano
- first_name: Luis E.
full_name: Salazar Manzano, Luis E.
last_name: Salazar Manzano
- first_name: Ryan J.
full_name: Oelkers, Ryan J.
last_name: Oelkers
- first_name: Joannes C
full_name: van Roestel, Joannes C
id: 4d122fc8-6083-11f0-87a5-97d68b860333
last_name: van Roestel
citation:
ama: Kára J, Rivera Sandoval L, Mendoza W, et al. A study of transients from ground-based
surveys reveals new ultra-compact accreting white dwarf binaries. Publications
of the Astronomical Society of Australia. 2026;43. doi:10.1017/pasa.2026.10184
apa: Kára, J., Rivera Sandoval, L., Mendoza, W., Maccarone, T., Pichardo Marcano,
M., Salazar Manzano, L. E., … van Roestel, J. C. (2026). A study of transients
from ground-based surveys reveals new ultra-compact accreting white dwarf binaries.
Publications of the Astronomical Society of Australia. Cambridge University
Press. https://doi.org/10.1017/pasa.2026.10184
chicago: Kára, Jan, Liliana Rivera Sandoval, Wendy Mendoza, Thomas Maccarone, Manuel
Pichardo Marcano, Luis E. Salazar Manzano, Ryan J. Oelkers, and Joannes C van
Roestel. “A Study of Transients from Ground-Based Surveys Reveals New Ultra-Compact
Accreting White Dwarf Binaries.” Publications of the Astronomical Society of
Australia. Cambridge University Press, 2026. https://doi.org/10.1017/pasa.2026.10184.
ieee: J. Kára et al., “A study of transients from ground-based surveys reveals
new ultra-compact accreting white dwarf binaries,” Publications of the Astronomical
Society of Australia, vol. 43. Cambridge University Press, 2026.
ista: Kára J, Rivera Sandoval L, Mendoza W, Maccarone T, Pichardo Marcano M, Salazar
Manzano LE, Oelkers RJ, van Roestel JC. 2026. A study of transients from ground-based
surveys reveals new ultra-compact accreting white dwarf binaries. Publications
of the Astronomical Society of Australia. 43, e052.
mla: Kára, Jan, et al. “A Study of Transients from Ground-Based Surveys Reveals
New Ultra-Compact Accreting White Dwarf Binaries.” Publications of the Astronomical
Society of Australia, vol. 43, e052, Cambridge University Press, 2026, doi:10.1017/pasa.2026.10184.
short: J. Kára, L. Rivera Sandoval, W. Mendoza, T. Maccarone, M. Pichardo Marcano,
L.E. Salazar Manzano, R.J. Oelkers, J.C. van Roestel, Publications of the Astronomical
Society of Australia 43 (2026).
date_created: 2026-05-07T08:55:00Z
date_published: 2026-03-27T00:00:00Z
date_updated: 2026-05-12T06:57:40Z
day: '27'
ddc:
- '520'
department:
- _id: IlCa
doi: 10.1017/pasa.2026.10184
file:
- access_level: open_access
checksum: f8f3cd3765948e8b276176c71c9d4e02
content_type: application/pdf
creator: dernst
date_created: 2026-05-12T06:54:10Z
date_updated: 2026-05-12T06:54:10Z
file_id: '21862'
file_name: 2026_PublAstronomicalSocAustralia_Kara.pdf
file_size: 3681016
relation: main_file
success: 1
file_date_updated: 2026-05-12T06:54:10Z
has_accepted_license: '1'
intvolume: ' 43'
language:
- iso: eng
month: '03'
oa: 1
oa_version: Published Version
publication: Publications of the Astronomical Society of Australia
publication_identifier:
eissn:
- 1448-6083
issn:
- 1323-3580
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: A study of transients from ground-based surveys reveals new ultra-compact accreting
white dwarf binaries
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 43
year: '2026'
...
---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
PlanS_conform: '1'
_id: '21897'
abstract:
- lang: eng
text: Ultracompact binary systems, consisting of two compact objects in an orbit
$\lesssim 0.5 {\rm R}_\odot$, should exhibit measurable rates of orbital period
change ($\dot{P} \ne 0$) due to the emission of gravitational waves (GWs). Measurements
of $\dot{P}$ have so far been limited to the shortest-period ultracompact binaries
($\lesssim 20$ min). Among the AM CVn-type subclass, several works have proposed
the presence of extra angular momentum loss beyond GW emission, with magnetic
braking being a widely discussed mechanism. If present, this magnetic braking
would dominate the angular momentum loss of AM CVn-type binaries with orbital
periods $\gtrsim 30$ min. In this work, we present a long-term eclipse timing
study of two AM CVn-type binaries, YZ LMi and Gaia14aae, with respective orbital
periods of 28.3 min and 49.7 min and continuous observations since 2006 and 2015.
Both systems show $\dot{P}$ consistent with zero within $2\sigma$. Their $3\sigma$
upper limits are $1.1 \times 10^{-13}\, {\rm s \, s}^{-1}$ and $9.7 \times 10^{-14}\,
{\rm s \, s}^{-1}$, respectively. These non-detections are most simply explained
by a scenario in which secular angular momentum loss is not substantially stronger
than GW emission at all orbital periods, but is combined with deviations from
the secular $\dot{P}$ whose time-scales span decades but whose amplitude is $\lesssim
10^{-13}\, {\rm s \, s}^{-1}$. Our non-detections of $\dot{P}$ represent a limit
on the strength of any enhanced angular momentum loss beyond pure GW emission.
acknowledgement: "We are grateful to the anonymousreferee fortheirinsightful comments.
MJG thanks Mitch Begelman and the JILA department at the University of Colorado,
Boulder, for providing office space at which much of this paper was written. This
work is supported in part by the United States National Aeronautics and Space Administration
(NASA) under grants\r\n80NSSC24K0436, 80NSSC22K0479, and 80NSSC24K0380, and the
United States National Science Foundation (NSF) under grant AST-2508429. VSD and
HiPERCAM are funded by the Science and Technology Facilities Council (grant ST/Z000033/1).
IP acknowledges support from the Royal Society through a University Research Fellowship
(URF\\R1\\231496). This project has received funding from the European Research
Council under the European Union’s Horizon 2020 research and innovation programme
(grant agreement numbers 101002408 – MOS100PC). CMC receives funding from United
Kingdom Research and Innovation grant numbers ST/X005933/1 and ST/W001934/1. This
article is based in part on observations made in the Observatorios de Canarias del
Instituto de Astrofísica de Canarias (IAC) with the the William Herschel Telescope
(WHT) operated on the island of La Palma by the Isaac Newton Group (ING) in the
Observatorio del Roque de los Muchachos. It is also based in part on observations
made with the Gran Telescopio Canarias (GTC) under proposal ID GTC18-24A, installed
at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica
de Canarias, in the island of La Palma. Further data were obtained using the 2.4
m Thai National Telescope (TNT) operated by the National Astronomy Research Institute
of Thailand\r\n(NARIT), and the 200-inch Hale Telescope at Palomar Observatory operated
by the California Institute of Technology. Software packages used in this work include
the ultracam and hipercam reduction pipelines, lcurve (C. M. Copperwheat et al.
2010), numpy, astropy, matplotlib, and emcee (D. Foreman-Mackey et al. 2013)."
article_number: stag673
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Matthew J
full_name: Green, Matthew J
last_name: Green
- first_name: Thomas R
full_name: Marsh, Thomas R
last_name: Marsh
- first_name: Joannes C
full_name: van Roestel, Joannes C
id: 4d122fc8-6083-11f0-87a5-97d68b860333
last_name: van Roestel
- first_name: Tin Long Sunny
full_name: Wong, Tin Long Sunny
last_name: Wong
- first_name: Diogo
full_name: Belloni, Diogo
last_name: Belloni
- first_name: Mukremin
full_name: Kilic, Mukremin
last_name: Kilic
- first_name: Elmé
full_name: Breedt, Elmé
last_name: Breedt
- first_name: Alex
full_name: Brown, Alex
last_name: Brown
- first_name: Chris M
full_name: Copperwheat, Chris M
last_name: Copperwheat
- first_name: Anurak
full_name: Chakpor, Anurak
last_name: Chakpor
- first_name: V S
full_name: Dhillon, V S
last_name: Dhillon
- first_name: Noel Castro
full_name: Segura, Noel Castro
last_name: Segura
- first_name: Martin J
full_name: Dyer, Martin J
last_name: Dyer
- first_name: James
full_name: Garbutt, James
last_name: Garbutt
- first_name: Dan
full_name: Jarvis, Dan
last_name: Jarvis
- first_name: Vasu
full_name: Kengkriangkrai, Vasu
last_name: Kengkriangkrai
- first_name: Mark R
full_name: Kennedy, Mark R
last_name: Kennedy
- first_name: Paul
full_name: Kerry, Paul
last_name: Kerry
- first_name: Thomas
full_name: Kupfer, Thomas
last_name: Kupfer
- first_name: S P
full_name: Littlefair, S P
last_name: Littlefair
- first_name: James
full_name: McCormac, James
last_name: McCormac
- first_name: James
full_name: Munday, James
last_name: Munday
- first_name: Steven G
full_name: Parsons, Steven G
last_name: Parsons
- first_name: Eleanor
full_name: Pike, Eleanor
last_name: Pike
- first_name: Ingrid
full_name: Pelisoli, Ingrid
last_name: Pelisoli
- first_name: Pablo
full_name: Rodríguez-Gil, Pablo
last_name: Rodríguez-Gil
- first_name: David I
full_name: Sahman, David I
last_name: Sahman
- first_name: Amalie
full_name: Yates, Amalie
last_name: Yates
citation:
ama: Green MJ, Marsh TR, van Roestel JC, et al. No period change in two long-period
AM CVn binaries. Monthly Notices of the Royal Astronomical Society. 2026;548(3).
doi:10.1093/mnras/stag673
apa: Green, M. J., Marsh, T. R., van Roestel, J. C., Wong, T. L. S., Belloni, D.,
Kilic, M., … Yates, A. (2026). No period change in two long-period AM CVn binaries.
Monthly Notices of the Royal Astronomical Society. Oxford University Press.
https://doi.org/10.1093/mnras/stag673
chicago: Green, Matthew J, Thomas R Marsh, Joannes C van Roestel, Tin Long Sunny
Wong, Diogo Belloni, Mukremin Kilic, Elmé Breedt, et al. “No Period Change in
Two Long-Period AM CVn Binaries.” Monthly Notices of the Royal Astronomical
Society. Oxford University Press, 2026. https://doi.org/10.1093/mnras/stag673.
ieee: M. J. Green et al., “No period change in two long-period AM CVn binaries,”
Monthly Notices of the Royal Astronomical Society, vol. 548, no. 3. Oxford
University Press, 2026.
ista: Green MJ, Marsh TR, van Roestel JC, Wong TLS, Belloni D, Kilic M, Breedt E,
Brown A, Copperwheat CM, Chakpor A, Dhillon VS, Segura NC, Dyer MJ, Garbutt J,
Jarvis D, Kengkriangkrai V, Kennedy MR, Kerry P, Kupfer T, Littlefair SP, McCormac
J, Munday J, Parsons SG, Pike E, Pelisoli I, Rodríguez-Gil P, Sahman DI, Yates
A. 2026. No period change in two long-period AM CVn binaries. Monthly Notices
of the Royal Astronomical Society. 548(3), stag673.
mla: Green, Matthew J., et al. “No Period Change in Two Long-Period AM CVn Binaries.”
Monthly Notices of the Royal Astronomical Society, vol. 548, no. 3, stag673,
Oxford University Press, 2026, doi:10.1093/mnras/stag673.
short: M.J. Green, T.R. Marsh, J.C. van Roestel, T.L.S. Wong, D. Belloni, M. Kilic,
E. Breedt, A. Brown, C.M. Copperwheat, A. Chakpor, V.S. Dhillon, N.C. Segura,
M.J. Dyer, J. Garbutt, D. Jarvis, V. Kengkriangkrai, M.R. Kennedy, P. Kerry, T.
Kupfer, S.P. Littlefair, J. McCormac, J. Munday, S.G. Parsons, E. Pike, I. Pelisoli,
P. Rodríguez-Gil, D.I. Sahman, A. Yates, Monthly Notices of the Royal Astronomical
Society 548 (2026).
date_created: 2026-05-20T14:34:03Z
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title: No period change in two long-period AM CVn binaries
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