New light on the Gaia DR2 parallax zero-point: influence of the asteroseismic approach, in and beyond the Kepler field

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New light on the Gaia DR2 parallax zero-point : influence of the asteroseismic approach, in and beyond the Kepler field. / Khan, Saniya; Miglio, Andrea; Mosser, Benoît; Arenou, Frédéric; Belkacem, Kévin; Brown, Anthony G. A.; Katz, David; Casagrande, Luca; Chaplin, William J.; Davies, Guy R.; Rendle, Ben M.; Rodrigues, Thaíse S.; Bossini, Diego; Cantat-Gaudin, Tristan; Elsworth, Yvonne P.; Girardi, Leo; North, Thomas S. H.; Vallenari, Antonella.

In: Astronomy and Astrophysics, Vol. 628, A35, 01.08.2019, p. 1-15.

Research output: Contribution to journalArticlepeer-review

Harvard

Khan, S, Miglio, A, Mosser, B, Arenou, F, Belkacem, K, Brown, AGA, Katz, D, Casagrande, L, Chaplin, WJ, Davies, GR, Rendle, BM, Rodrigues, TS, Bossini, D, Cantat-Gaudin, T, Elsworth, YP, Girardi, L, North, TSH & Vallenari, A 2019, 'New light on the Gaia DR2 parallax zero-point: influence of the asteroseismic approach, in and beyond the Kepler field', Astronomy and Astrophysics, vol. 628, A35, pp. 1-15. https://doi.org/10.1051/0004-6361/201935304

APA

Khan, S., Miglio, A., Mosser, B., Arenou, F., Belkacem, K., Brown, A. G. A., Katz, D., Casagrande, L., Chaplin, W. J., Davies, G. R., Rendle, B. M., Rodrigues, T. S., Bossini, D., Cantat-Gaudin, T., Elsworth, Y. P., Girardi, L., North, T. S. H., & Vallenari, A. (2019). New light on the Gaia DR2 parallax zero-point: influence of the asteroseismic approach, in and beyond the Kepler field. Astronomy and Astrophysics, 628, 1-15. [A35]. https://doi.org/10.1051/0004-6361/201935304

Vancouver

Author

Khan, Saniya ; Miglio, Andrea ; Mosser, Benoît ; Arenou, Frédéric ; Belkacem, Kévin ; Brown, Anthony G. A. ; Katz, David ; Casagrande, Luca ; Chaplin, William J. ; Davies, Guy R. ; Rendle, Ben M. ; Rodrigues, Thaíse S. ; Bossini, Diego ; Cantat-Gaudin, Tristan ; Elsworth, Yvonne P. ; Girardi, Leo ; North, Thomas S. H. ; Vallenari, Antonella. / New light on the Gaia DR2 parallax zero-point : influence of the asteroseismic approach, in and beyond the Kepler field. In: Astronomy and Astrophysics. 2019 ; Vol. 628. pp. 1-15.

Bibtex

@article{9bf63727a0484bcdbd1149fde121a36e,
title = "New light on the Gaia DR2 parallax zero-point: influence of the asteroseismic approach, in and beyond the Kepler field",
abstract = "The importance of studying the Gaia DR2 parallax zero-point by external means was underlined by Lindegren et al. (2018), and initiated by several works making use of Cepheids, eclipsing binaries, and asteroseismology. Despite a very efficient elimination of basic-angle variations, a small fluctuation remains and shows up as a small offset in the Gaia DR2 parallaxes. By combining astrometric, asteroseismic, spectroscopic, and photometric constraints, we undertake a new analysis of the Gaia parallax offset for nearly 3000 red-giant branch (RGB) and 2200 red clump (RC) stars observed by Kepler, as well as about 500 and 700 red giants (both RGB and RC) selected by the K2 Galactic Archaeology Program in campaigns 3 and 6. Engaging into a thorough comparison of the astrometric and asteroseismic parallaxes, we are able to highlight the influence of the asteroseismic method, and measure parallax offsets in the Kepler field that are compatible with independent estimates from literature and open clusters. Moreover, adding the K2 fields to our investigation allows us to retrieve a clear illustration of the positional dependence of the zero-point, in general agreement with the information provided by quasars. Lastly, we initiate a two-step methodology to make progress in the simultaneous calibration of the asteroseismic scaling relations and of the Gaia DR2 parallax offset, which will greatly benefit from the gain in precision with the third Data Release of Gaia. ",
keywords = "astro-ph.SR, asteroseismology, astrometry, parallaxes, stars: low-mass",
author = "Saniya Khan and Andrea Miglio and Beno{\^i}t Mosser and Fr{\'e}d{\'e}ric Arenou and K{\'e}vin Belkacem and Brown, {Anthony G. A.} and David Katz and Luca Casagrande and Chaplin, {William J.} and Davies, {Guy R.} and Rendle, {Ben M.} and Rodrigues, {Tha{\'i}se S.} and Diego Bossini and Tristan Cantat-Gaudin and Elsworth, {Yvonne P.} and Leo Girardi and North, {Thomas S. H.} and Antonella Vallenari",
year = "2019",
month = aug,
day = "1",
doi = "10.1051/0004-6361/201935304",
language = "English",
volume = "628",
pages = "1--15",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",

}

RIS

TY - JOUR

T1 - New light on the Gaia DR2 parallax zero-point

T2 - influence of the asteroseismic approach, in and beyond the Kepler field

AU - Khan, Saniya

AU - Miglio, Andrea

AU - Mosser, Benoît

AU - Arenou, Frédéric

AU - Belkacem, Kévin

AU - Brown, Anthony G. A.

AU - Katz, David

AU - Casagrande, Luca

AU - Chaplin, William J.

AU - Davies, Guy R.

AU - Rendle, Ben M.

AU - Rodrigues, Thaíse S.

AU - Bossini, Diego

AU - Cantat-Gaudin, Tristan

AU - Elsworth, Yvonne P.

AU - Girardi, Leo

AU - North, Thomas S. H.

AU - Vallenari, Antonella

PY - 2019/8/1

Y1 - 2019/8/1

N2 - The importance of studying the Gaia DR2 parallax zero-point by external means was underlined by Lindegren et al. (2018), and initiated by several works making use of Cepheids, eclipsing binaries, and asteroseismology. Despite a very efficient elimination of basic-angle variations, a small fluctuation remains and shows up as a small offset in the Gaia DR2 parallaxes. By combining astrometric, asteroseismic, spectroscopic, and photometric constraints, we undertake a new analysis of the Gaia parallax offset for nearly 3000 red-giant branch (RGB) and 2200 red clump (RC) stars observed by Kepler, as well as about 500 and 700 red giants (both RGB and RC) selected by the K2 Galactic Archaeology Program in campaigns 3 and 6. Engaging into a thorough comparison of the astrometric and asteroseismic parallaxes, we are able to highlight the influence of the asteroseismic method, and measure parallax offsets in the Kepler field that are compatible with independent estimates from literature and open clusters. Moreover, adding the K2 fields to our investigation allows us to retrieve a clear illustration of the positional dependence of the zero-point, in general agreement with the information provided by quasars. Lastly, we initiate a two-step methodology to make progress in the simultaneous calibration of the asteroseismic scaling relations and of the Gaia DR2 parallax offset, which will greatly benefit from the gain in precision with the third Data Release of Gaia.

AB - The importance of studying the Gaia DR2 parallax zero-point by external means was underlined by Lindegren et al. (2018), and initiated by several works making use of Cepheids, eclipsing binaries, and asteroseismology. Despite a very efficient elimination of basic-angle variations, a small fluctuation remains and shows up as a small offset in the Gaia DR2 parallaxes. By combining astrometric, asteroseismic, spectroscopic, and photometric constraints, we undertake a new analysis of the Gaia parallax offset for nearly 3000 red-giant branch (RGB) and 2200 red clump (RC) stars observed by Kepler, as well as about 500 and 700 red giants (both RGB and RC) selected by the K2 Galactic Archaeology Program in campaigns 3 and 6. Engaging into a thorough comparison of the astrometric and asteroseismic parallaxes, we are able to highlight the influence of the asteroseismic method, and measure parallax offsets in the Kepler field that are compatible with independent estimates from literature and open clusters. Moreover, adding the K2 fields to our investigation allows us to retrieve a clear illustration of the positional dependence of the zero-point, in general agreement with the information provided by quasars. Lastly, we initiate a two-step methodology to make progress in the simultaneous calibration of the asteroseismic scaling relations and of the Gaia DR2 parallax offset, which will greatly benefit from the gain in precision with the third Data Release of Gaia.

KW - astro-ph.SR

KW - asteroseismology

KW - astrometry

KW - parallaxes

KW - stars: low-mass

U2 - 10.1051/0004-6361/201935304

DO - 10.1051/0004-6361/201935304

M3 - Article

VL - 628

SP - 1

EP - 15

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A35

ER -