---
_id: '13447'
abstract:
- lang: eng
text: Asteroseismology has transformed stellar astrophysics. Red giant asteroseismology
is a prime example, with oscillation periods and amplitudes that are readily detectable
with time-domain space-based telescopes. These oscillations can be used to infer
masses, ages and radii for large numbers of stars, providing unique constraints
on stellar populations in our galaxy. The cadence, duration, and spatial resolution
of the Roman galactic bulge time-domain survey (GBTDS) are well-suited for asteroseismology
and will probe an important population not studied by prior missions. We identify
photometric precision as a key requirement for realizing the potential of asteroseismology
with Roman. A precision of 1 mmag per 15-min cadence or better for saturated stars
will enable detections of the populous red clump star population in the Galactic
bulge. If the survey efficiency is better than expected, we argue for repeat observations
of the same fields to improve photometric precision, or covering additional fields
to expand the stellar population reach if the photometric precision for saturated
stars is better than 1 mmag. Asteroseismology is relatively insensitive to the
timing of the observations during the mission, and the prime red clump targets
can be observed in a single 70 day campaign in any given field. Complementary
stellar characterization, particularly astrometry tied to the Gaia system, will
also dramatically expand the diagnostic power of asteroseismology. We also highlight
synergies to Roman GBTDS exoplanet science using transits and microlensing.
article_number: '2307.03237'
article_processing_charge: No
author:
- first_name: Daniel
full_name: Huber, Daniel
last_name: Huber
- first_name: Marc
full_name: Pinsonneault, Marc
last_name: Pinsonneault
- first_name: Paul
full_name: Beck, Paul
last_name: Beck
- first_name: Timothy R.
full_name: Bedding, Timothy R.
last_name: Bedding
- first_name: Joss Bland-Hawthorn
full_name: Joss Bland-Hawthorn, Joss Bland-Hawthorn
last_name: Joss Bland-Hawthorn
- first_name: Sylvain N.
full_name: Breton, Sylvain N.
last_name: Breton
- first_name: Lisa Annabelle
full_name: Bugnet, Lisa Annabelle
id: d9edb345-f866-11ec-9b37-d119b5234501
last_name: Bugnet
orcid: 0000-0003-0142-4000
- first_name: William J.
full_name: Chaplin, William J.
last_name: Chaplin
- first_name: Rafael A.
full_name: Garcia, Rafael A.
last_name: Garcia
- first_name: Samuel K.
full_name: Grunblatt, Samuel K.
last_name: Grunblatt
- first_name: Joyce A.
full_name: Guzik, Joyce A.
last_name: Guzik
- first_name: Saskia
full_name: Hekker, Saskia
last_name: Hekker
- first_name: Steven D.
full_name: Kawaler, Steven D.
last_name: Kawaler
- first_name: Stephane
full_name: Mathis, Stephane
last_name: Mathis
- first_name: Savita
full_name: Mathur, Savita
last_name: Mathur
- first_name: Travis
full_name: Metcalfe, Travis
last_name: Metcalfe
- first_name: Benoit
full_name: Mosser, Benoit
last_name: Mosser
- first_name: Melissa K.
full_name: Ness, Melissa K.
last_name: Ness
- first_name: Anthony L.
full_name: Piro, Anthony L.
last_name: Piro
- first_name: Aldo
full_name: Serenelli, Aldo
last_name: Serenelli
- first_name: Sanjib
full_name: Sharma, Sanjib
last_name: Sharma
- first_name: David R.
full_name: Soderblom, David R.
last_name: Soderblom
- first_name: Keivan G.
full_name: Stassun, Keivan G.
last_name: Stassun
- first_name: Dennis
full_name: Stello, Dennis
last_name: Stello
- first_name: Jamie
full_name: Tayar, Jamie
last_name: Tayar
- first_name: Gerard T. van
full_name: Belle, Gerard T. van
last_name: Belle
- first_name: Joel C.
full_name: Zinn, Joel C.
last_name: Zinn
citation:
ama: Huber D, Pinsonneault M, Beck P, et al. Asteroseismology with the Roman galactic
bulge time-domain survey. arXiv. doi:10.48550/arXiv.2307.03237
apa: Huber, D., Pinsonneault, M., Beck, P., Bedding, T. R., Joss Bland-Hawthorn,
J. B.-H., Breton, S. N., … Zinn, J. C. (n.d.). Asteroseismology with the Roman
galactic bulge time-domain survey. arXiv. https://doi.org/10.48550/arXiv.2307.03237
chicago: Huber, Daniel, Marc Pinsonneault, Paul Beck, Timothy R. Bedding, Joss Bland-Hawthorn
Joss Bland-Hawthorn, Sylvain N. Breton, Lisa Annabelle Bugnet, et al. “Asteroseismology
with the Roman Galactic Bulge Time-Domain Survey.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2307.03237.
ieee: D. Huber et al., “Asteroseismology with the Roman galactic bulge time-domain
survey,” arXiv. .
ista: Huber D, Pinsonneault M, Beck P, Bedding TR, Joss Bland-Hawthorn JB-H, Breton
SN, Bugnet LA, Chaplin WJ, Garcia RA, Grunblatt SK, Guzik JA, Hekker S, Kawaler
SD, Mathis S, Mathur S, Metcalfe T, Mosser B, Ness MK, Piro AL, Serenelli A, Sharma
S, Soderblom DR, Stassun KG, Stello D, Tayar J, Belle GT van, Zinn JC. Asteroseismology
with the Roman galactic bulge time-domain survey. arXiv, 2307.03237.
mla: Huber, Daniel, et al. “Asteroseismology with the Roman Galactic Bulge Time-Domain
Survey.” ArXiv, 2307.03237, doi:10.48550/arXiv.2307.03237.
short: D. Huber, M. Pinsonneault, P. Beck, T.R. Bedding, J.B.-H. Joss Bland-Hawthorn,
S.N. Breton, L.A. Bugnet, W.J. Chaplin, R.A. Garcia, S.K. Grunblatt, J.A. Guzik,
S. Hekker, S.D. Kawaler, S. Mathis, S. Mathur, T. Metcalfe, B. Mosser, M.K. Ness,
A.L. Piro, A. Serenelli, S. Sharma, D.R. Soderblom, K.G. Stassun, D. Stello, J.
Tayar, G.T. van Belle, J.C. Zinn, ArXiv (n.d.).
date_created: 2023-08-02T07:30:43Z
date_published: 2023-07-06T00:00:00Z
date_updated: 2023-08-02T07:36:00Z
day: '06'
department:
- _id: LiBu
doi: 10.48550/arXiv.2307.03237
external_id:
arxiv:
- '2307.03237'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2307.03237
month: '07'
oa: 1
oa_version: Preprint
publication: arXiv
publication_status: submitted
status: public
title: Asteroseismology with the Roman galactic bulge time-domain survey
type: preprint
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2023'
...
---
_id: '14256'
abstract:
- lang: eng
text: "Context. Space asteroseismology is revolutionizing our knowledge of the internal
structure and dynamics of stars. A breakthrough is ongoing with the recent discoveries
of signatures of strong magnetic fields in the core of red giant stars. The key
signature for such a detection is the asymmetry these fields induce in the frequency
splittings of observed dipolar mixed gravito-acoustic modes.\r\nAims. We investigate
the ability of the observed asymmetries of the frequency splittings of dipolar
mixed modes to constrain the geometrical properties of deep magnetic fields.\r\nMethods.
We used the powerful analytical Racah-Wigner algebra used in quantum mechanics
to characterize the geometrical couplings of dipolar mixed oscillation modes with
various realistically plausible topologies of fossil magnetic fields. We also
computed the induced perturbation of their frequencies.\r\nResults. First, in
the case of an oblique magnetic dipole, we provide the exact analytical expression
of the asymmetry as a function of the angle between the rotation and magnetic
axes. Its value provides a direct measure of this angle. Second, considering a
combination of axisymmetric dipolar and quadrupolar fields, we show how the asymmetry
is blind to the unraveling of the relative strength and sign of each component.
Finally, in the case of a given multipole, we show that a negative asymmetry is
a signature of non-axisymmetric topologies.\r\nConclusions. Asymmetries of dipolar
mixed modes provide a key bit of information on the geometrical topology of deep
fossil magnetic fields, but this is insufficient on its own. Asteroseismic constraints
should therefore be combined with spectropolarimetric observations and numerical
simulations, which aim to predict the more probable stable large-scale geometries."
acknowledgement: The authors are grateful to the referee for her/his detailed and
constructive report, which has allowed us to improve our article. S. M. acknowledges
support from the CNES GOLF-SOHO and PLATO grants at CEA/DAp and PNPS (CNRS/INSU).
We thank R. A. Garcia for fruitful discussions and suggestions.
article_number: L9
article_processing_charge: Yes (in subscription journal)
article_type: letter_note
author:
- first_name: S.
full_name: Mathis, S.
last_name: Mathis
- first_name: Lisa Annabelle
full_name: Bugnet, Lisa Annabelle
id: d9edb345-f866-11ec-9b37-d119b5234501
last_name: Bugnet
orcid: 0000-0003-0142-4000
citation:
ama: 'Mathis S, Bugnet LA. Asymmetries of frequency splittings of dipolar mixed
modes: A window on the topology of deep magnetic fields. Astronomy and Astrophysics.
2023;676. doi:10.1051/0004-6361/202346832'
apa: 'Mathis, S., & Bugnet, L. A. (2023). Asymmetries of frequency splittings
of dipolar mixed modes: A window on the topology of deep magnetic fields. Astronomy
and Astrophysics. EDP Sciences. https://doi.org/10.1051/0004-6361/202346832'
chicago: 'Mathis, S., and Lisa Annabelle Bugnet. “Asymmetries of Frequency Splittings
of Dipolar Mixed Modes: A Window on the Topology of Deep Magnetic Fields.” Astronomy
and Astrophysics. EDP Sciences, 2023. https://doi.org/10.1051/0004-6361/202346832.'
ieee: 'S. Mathis and L. A. Bugnet, “Asymmetries of frequency splittings of dipolar
mixed modes: A window on the topology of deep magnetic fields,” Astronomy and
Astrophysics, vol. 676. EDP Sciences, 2023.'
ista: 'Mathis S, Bugnet LA. 2023. Asymmetries of frequency splittings of dipolar
mixed modes: A window on the topology of deep magnetic fields. Astronomy and Astrophysics.
676, L9.'
mla: 'Mathis, S., and Lisa Annabelle Bugnet. “Asymmetries of Frequency Splittings
of Dipolar Mixed Modes: A Window on the Topology of Deep Magnetic Fields.” Astronomy
and Astrophysics, vol. 676, L9, EDP Sciences, 2023, doi:10.1051/0004-6361/202346832.'
short: S. Mathis, L.A. Bugnet, Astronomy and Astrophysics 676 (2023).
date_created: 2023-09-03T22:01:15Z
date_published: 2023-08-01T00:00:00Z
date_updated: 2023-09-06T11:05:58Z
day: '01'
ddc:
- '520'
department:
- _id: LiBu
doi: 10.1051/0004-6361/202346832
external_id:
arxiv:
- '2306.11587'
isi:
- '001046037700007'
file:
- access_level: open_access
checksum: 7b30d26fb2b7bcb5b5be1414950615f9
content_type: application/pdf
creator: dernst
date_created: 2023-09-06T07:13:19Z
date_updated: 2023-09-06T07:13:19Z
file_id: '14271'
file_name: 2023_AstronomyAstrophysics_Mathis.pdf
file_size: 458120
relation: main_file
success: 1
file_date_updated: 2023-09-06T07:13:19Z
has_accepted_license: '1'
intvolume: ' 676'
isi: 1
language:
- iso: eng
month: '08'
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: 'Asymmetries of frequency splittings of dipolar mixed modes: A window on the
topology of deep magnetic fields'
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: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 676
year: '2023'
...
---
_id: '13443'
abstract:
- lang: eng
text: 'The ages of solar-like stars have been at the center of many studies such
as exoplanet characterization or Galactic-archeology. While ages are usually computed
from stellar evolution models, relations linking ages to other stellar properties,
such as rotation and magnetic activity, have been investigated. With the large
catalog of 55,232 rotation periods, Prot, and photometric magnetic activity index,
Sph from Kepler data, we have the opportunity to look for such magneto-gyro-chronology
relations. Stellar ages are obtained with two stellar evolution codes that include
treatment of angular momentum evolution, hence using Prot as input in addition
to classical atmospheric parameters. We explore two different ways of predicting
stellar ages on three subsamples with spectroscopic observations: solar analogs,
late-F and G dwarfs, and K dwarfs. We first perform a Bayesian analysis to derive
relations between Sph and ages between 1 and 5 Gyr, and other stellar properties.
For late-F and G dwarfs, and K dwarfs, the multivariate regression favors the
model with Prot and Sph with median differences of 0.1% and 0.2%, respectively.
We also apply Machine Learning techniques with a Random Forest algorithm to predict
ages up to 14 Gyr with the same set of input parameters. For late-F, G and K dwarfs
together, predicted ages are on average within 5.3% of the model ages and improve
to 3.1% when including Prot. These are very promising results for a quick age
estimation for solar-like stars with photometric observations, especially with
current and future space missions.'
acknowledgement: 'This paper includes data collected by the Kepler mission and obtained
from the MAST data archive at the Space Telescope Science Institute (STScI). Funding
for the Kepler mission is provided by the NASA Science Mission Directorate. STScI
is operated by the Association of Universities for Research in Astronomy, Inc.,
under NASA contract NAS 5–26555. We acknowledge that this research was supported
in part by the National Science Foundation under grant No. NSF PHY-1748958. S.M.
acknowledges support from the Spanish Ministry of Science and Innovation (MICINN)
with the Ramón y Cajal fellowship No. RYC-2015-17697, the grant No. PID2019-107061GB-C66,
and through AEI under the Severo Ochoa Centres of Excellence Programme 2020–2023
(CEX2019-000920-S). S.M. and D.G.R. acknowledge support from the Spanish Ministry
of Science and Innovation (MICINN) with the grant No. PID2019-107187GB-I00. Z.R.C.
acknowledges support from National Aeronautics and Space Administration via the
TESS Guest Investigator Program (grant No. 80NSSC18K18584). The work presented here
was partially supported by the NASA grant NNX17AF27G. A.R.G.S. acknowledges the
support by FCT through national funds and by FEDER through COMPETE2020 by the following
grants: UIDB/04434/2020 and UIDP/04434/2020. A.R.G.S. is supported by FCT through
the work contract No. 2020.02480.CEECIND/CP1631/CT0001. R.A.G., L.A., and S.N.B.
acknowledge the support from PLATO and GOLF CNES grants. S.N.B. acknowledges support
from PLATO ASI-INAF agreement No. 2015-019-R.1-2018.'
article_number: '131'
article_processing_charge: Yes
article_type: original
author:
- first_name: Savita
full_name: Mathur, Savita
last_name: Mathur
- first_name: Zachary R.
full_name: Claytor, Zachary R.
last_name: Claytor
- first_name: Ângela R. G.
full_name: Santos, Ângela R. G.
last_name: Santos
- first_name: Rafael A.
full_name: García, Rafael A.
last_name: García
- first_name: Louis
full_name: Amard, Louis
last_name: Amard
- first_name: Lisa Annabelle
full_name: Bugnet, Lisa Annabelle
id: d9edb345-f866-11ec-9b37-d119b5234501
last_name: Bugnet
orcid: 0000-0003-0142-4000
- first_name: Enrico
full_name: Corsaro, Enrico
last_name: Corsaro
- first_name: Alfio
full_name: Bonanno, Alfio
last_name: Bonanno
- first_name: Sylvain N.
full_name: Breton, Sylvain N.
last_name: Breton
- first_name: Diego
full_name: Godoy-Rivera, Diego
last_name: Godoy-Rivera
- first_name: Marc H.
full_name: Pinsonneault, Marc H.
last_name: Pinsonneault
- first_name: Jennifer
full_name: van Saders, Jennifer
last_name: van Saders
citation:
ama: Mathur S, Claytor ZR, Santos ÂRG, et al. Magnetic activity evolution of solar-like
stars. I. Sph–age relation derived from Kepler observations. The Astrophysical
Journal. 2023;952(2). doi:10.3847/1538-4357/acd118
apa: Mathur, S., Claytor, Z. R., Santos, Â. R. G., García, R. A., Amard, L., Bugnet,
L. A., … van Saders, J. (2023). Magnetic activity evolution of solar-like stars.
I. Sph–age relation derived from Kepler observations. The Astrophysical Journal.
American Astronomical Society. https://doi.org/10.3847/1538-4357/acd118
chicago: Mathur, Savita, Zachary R. Claytor, Ângela R. G. Santos, Rafael A. García,
Louis Amard, Lisa Annabelle Bugnet, Enrico Corsaro, et al. “Magnetic Activity
Evolution of Solar-like Stars. I. Sph–Age Relation Derived from Kepler Observations.”
The Astrophysical Journal. American Astronomical Society, 2023. https://doi.org/10.3847/1538-4357/acd118.
ieee: S. Mathur et al., “Magnetic activity evolution of solar-like stars.
I. Sph–age relation derived from Kepler observations,” The Astrophysical Journal,
vol. 952, no. 2. American Astronomical Society, 2023.
ista: Mathur S, Claytor ZR, Santos ÂRG, García RA, Amard L, Bugnet LA, Corsaro E,
Bonanno A, Breton SN, Godoy-Rivera D, Pinsonneault MH, van Saders J. 2023. Magnetic
activity evolution of solar-like stars. I. Sph–age relation derived from Kepler
observations. The Astrophysical Journal. 952(2), 131.
mla: Mathur, Savita, et al. “Magnetic Activity Evolution of Solar-like Stars. I.
Sph–Age Relation Derived from Kepler Observations.” The Astrophysical Journal,
vol. 952, no. 2, 131, American Astronomical Society, 2023, doi:10.3847/1538-4357/acd118.
short: S. Mathur, Z.R. Claytor, Â.R.G. Santos, R.A. García, L. Amard, L.A. Bugnet,
E. Corsaro, A. Bonanno, S.N. Breton, D. Godoy-Rivera, M.H. Pinsonneault, J. van
Saders, The Astrophysical Journal 952 (2023).
date_created: 2023-08-01T14:19:16Z
date_published: 2023-08-01T00:00:00Z
date_updated: 2023-12-13T12:00:15Z
day: '01'
ddc:
- '520'
department:
- _id: LiBu
doi: 10.3847/1538-4357/acd118
external_id:
isi:
- '001034185700001'
file:
- access_level: open_access
checksum: f12452834d7ed6748dbf5ace18af4723
content_type: application/pdf
creator: dernst
date_created: 2023-08-02T07:42:26Z
date_updated: 2023-08-02T07:42:26Z
file_id: '13448'
file_name: 2023_AstrophysicalJour_Mathur.pdf
file_size: 4192386
relation: main_file
success: 1
file_date_updated: 2023-08-02T07:42:26Z
has_accepted_license: '1'
intvolume: ' 952'
isi: 1
issue: '2'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
month: '08'
oa: 1
oa_version: Published Version
publication: The Astrophysical Journal
publication_identifier:
eissn:
- 1538-4357
issn:
- 0004-637X
publication_status: published
publisher: American Astronomical Society
quality_controlled: '1'
status: public
title: Magnetic activity evolution of solar-like stars. I. Sph–age relation derived
from Kepler observations
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: 952
year: '2023'
...