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TOI-1259Ab – a gas giant planet with 2.7 per cent deep transits and a bound white dwarf companion

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Martin, David V., El-Badry, Kareem, Hodžić, Vedad Kunovac, Triaud, Amaury H. M. J., Angus, Ruth, Birky, Jessica, Foreman-Mackey, Daniel, Hedges, Christina, Montet, Benjamin T., Murphy, Simon J. et al.
(2021) TOI-1259Ab – a gas giant planet with 2.7 per cent deep transits and a bound white dwarf companion. Monthly Notices of the Royal Astronomical Society, 507 (3). pp. 4132-4148. doi:10.1093/mnras/stab2129

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Official URL: https://doi.org/10.1093/mnras/stab2129

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Abstract

We present TOI-1259Ab, a 1.0RJup gas giant planet transiting a 0.71R⊙ K-dwarf on a 3.48 d orbit. The system also contains a bound white dwarf companion TOI-1259B with a projected distance of ∼1600 au from the planet host. Transits are observed in nine TESS sectors and are 2.7 per cent deep – among the deepest known – making TOI-1259Ab a promising target for atmospheric characterization. Our follow-up radial velocity measurements indicate a variability of semiamplitude $K=71\, \rm m\, s^{-1}$, implying a planet mass of 0.44MJup. By fitting the spectral energy distribution of the white dwarf, we derive a total age of $4.08^{+1.21}_{-0.53}$ Gyr for the system. The K dwarf’s light curve reveals rotational variability with a period of 28 d, which implies a gyrochronology age broadly consistent with the white dwarf’s total age.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Outer planets , Outer planets -- Atmospheres , White dwarf stars , Double stars, Low mass stars , Eclipsing binaries
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press (OUP)
ISSN: 1365-2966
Official Date: 27 July 2021
Dates:
DateEvent
27 July 2021Published
21 June 2021Accepted
Volume: 507
Number: 3
Page Range: pp. 4132-4148
DOI: 10.1093/mnras/stab2129
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDU.S.–Norway Fulbright Foundationhttps://fulbright.no/fulbright-norway/
G022253 [NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
P 400P2 186735[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
803193/BEBOPHorizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
UNSPECIFIEDUniversity of Birmingham.‏ School of Physics and Astronomyhttp://viaf.org/viaf/56162842119773040573
ST/L000733/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/P000495/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
DECRA DE180101104Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
FEUZ-2020-0038Ministry of Science and Higher Education of the Russian FederationUNSPECIFIED

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