Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit

N. L. Eisner; O. Barragán; S. Aigrain; C. Lintott; G. Miller; N. Zicher; T. S. Boyajian; C. Briceño; E. M. Bryant; J. L. Christiansen; A. D. Feinstein; L. M. Flor-Torres; M. Fridlund; D. Gandolfi; J. Gilbert; N. Guerrero; J. M. Jenkins; K. Jones; M. H. Kristiansen; A. Vanderburg; N. Law; A. R. López-Sánchez; A. W. Mann; E. J. Safron; M. E. Schwamb; K. G. Stassun; H. P. Osborn; J. Wang; A. Zic; C. Ziegler; F. Barnet; S. J. Bean; D. M. Bundy; Z. Chetnik; J. L. Dawson; J. Garstone; A. G. Stenner; M. Huten; S. Larish; L. D. Melanson; T. Mitchell; C. Moore; K. Peltsch; D. J. Rogers; C. Schuster; D. S. Smith; D. J. Simister; C. Tanner; I. Terentev; A. Tsymbal

doi:10.1093/mnras/staa138

Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit

N. L. Eisner, O. Barragán, S. Aigrain, C. Lintott, G. Miller, N. Zicher, T. S. Boyajian, C. Briceño, E. M. Bryant, J. L. Christiansen, A. D. Feinstein, L. M. Flor-Torres, M. Fridlund, D. Gandolfi, J. Gilbert, N. Guerrero, J. M. Jenkins, K. Jones, M. H. Kristiansen, A. VanderburgN. Law, A. R. López-Sánchez, A. W. Mann, E. J. Safron, M. E. Schwamb, K. G. Stassun, H. P. Osborn, J. Wang, A. Zic, C. Ziegler, F. Barnet, S. J. Bean, D. M. Bundy, Z. Chetnik, J. L. Dawson, J. Garstone, A. G. Stenner, M. Huten, S. Larish, L. D. Melanson, T. Mitchell, C. Moore, K. Peltsch, D. J. Rogers, C. Schuster, D. S. Smith, D. J. Simister, C. Tanner, I. Terentev, A. Tsymbal

School of Mathematics and Physics

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Abstract

We report on the discovery and validation of TOI 813 b (TIC 55525572 b), a transiting exoplanet identified by citizen scientists in data from NASA's Transiting Exoplanet Survey Satellite (TESS) and the first planet discovered by the Planet Hunters TESS project. The host star is a bright (V = 10.3 mag) subgiant (R\star - 1.94 R⊙, M\star = 1.32 M⊙). It was observed almost continuously by TESS during its first year of operations, during which time four individual transit events were detected. The candidate passed all the standard light curve-based vetting checks, and ground-based follow-up spectroscopy and speckle imaging enabled us to place an upper limit of 2 MJup (99 per cent confidence) on the mass of the companion, and to statistically validate its planetary nature. Detailed modelling of the transits yields a period of 83.8911-0.0031+0.0027 d, a planet radius of 6.71 ± 0.38 R⊕ and a semimajor axis of 0.423-0.037+0.031 AU. The planet's orbital period combined with the evolved nature of the host star places this object in a relatively underexplored region of parameter space. We estimate that TOI 813 b induces a reflex motion in its host star with a semi-amplitude of ∼6 m s-1, making this a promising system to measure the mass of a relatively long-period transiting planet.

Original language	English
Pages (from-to)	750-763
Journal	Monthly Notices of the Royal Astronomical Society
Volume	494
Issue number	1
Early online date	23 Jan 2020
DOIs	https://doi.org/10.1093/mnras/staa138
Publication status	Published - 01 May 2020

Keywords

methods: statistical
planets and satellites: detection
stars: fundamental parameters
stars: individual (TIC-55525572
TOI 813)

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10.1093/mnras/staa138Licence: Unspecified

Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit
© 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. Please refer to any applicable terms of use of the publisher.
Final published version, 13.2 MBLicence: Unspecified

http://adsabs.harvard.edu/abs/2020MNRAS.494..750E

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Eisner, N. L., Barragán, O., Aigrain, S., Lintott, C., Miller, G., Zicher, N., Boyajian, T. S., Briceño, C., Bryant, E. M., Christiansen, J. L., Feinstein, A. D., Flor-Torres, L. M., Fridlund, M., Gandolfi, D., Gilbert, J., Guerrero, N., Jenkins, J. M., Jones, K., Kristiansen, M. H., ... Tsymbal, A. (2020). Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit. Monthly Notices of the Royal Astronomical Society, 494(1), 750-763. https://doi.org/10.1093/mnras/staa138

@article{2ec3e4b1c2324233baedf8b709cb84e1,

title = "Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit",

abstract = "We report on the discovery and validation of TOI 813 b (TIC 55525572 b), a transiting exoplanet identified by citizen scientists in data from NASA's Transiting Exoplanet Survey Satellite (TESS) and the first planet discovered by the Planet Hunters TESS project. The host star is a bright (V = 10.3 mag) subgiant (R\star - 1.94 R⊙, M\star = 1.32 M⊙). It was observed almost continuously by TESS during its first year of operations, during which time four individual transit events were detected. The candidate passed all the standard light curve-based vetting checks, and ground-based follow-up spectroscopy and speckle imaging enabled us to place an upper limit of 2 MJup (99 per cent confidence) on the mass of the companion, and to statistically validate its planetary nature. Detailed modelling of the transits yields a period of 83.8911-0.0031+0.0027 d, a planet radius of 6.71 ± 0.38 R⊕ and a semimajor axis of 0.423-0.037+0.031 AU. The planet's orbital period combined with the evolved nature of the host star places this object in a relatively underexplored region of parameter space. We estimate that TOI 813 b induces a reflex motion in its host star with a semi-amplitude of ∼6 m s-1, making this a promising system to measure the mass of a relatively long-period transiting planet.",

keywords = "methods: statistical, planets and satellites: detection, stars: fundamental parameters, stars: individual (TIC-55525572, TOI 813)",

author = "Eisner, {N. L.} and O. Barrag{\'a}n and S. Aigrain and C. Lintott and G. Miller and N. Zicher and Boyajian, {T. S.} and C. Brice{\~n}o and Bryant, {E. M.} and Christiansen, {J. L.} and Feinstein, {A. D.} and Flor-Torres, {L. M.} and M. Fridlund and D. Gandolfi and J. Gilbert and N. Guerrero and Jenkins, {J. M.} and K. Jones and Kristiansen, {M. H.} and A. Vanderburg and N. Law and L{\'o}pez-S{\'a}nchez, {A. R.} and Mann, {A. W.} and Safron, {E. J.} and Schwamb, {M. E.} and Stassun, {K. G.} and Osborn, {H. P.} and J. Wang and A. Zic and C. Ziegler and F. Barnet and Bean, {S. J.} and Bundy, {D. M.} and Z. Chetnik and Dawson, {J. L.} and J. Garstone and Stenner, {A. G.} and M. Huten and S. Larish and Melanson, {L. D.} and T. Mitchell and C. Moore and K. Peltsch and Rogers, {D. J.} and C. Schuster and Smith, {D. S.} and Simister, {D. J.} and C. Tanner and I. Terentev and A. Tsymbal",

year = "2020",

month = may,

day = "1",

doi = "10.1093/mnras/staa138",

language = "English",

volume = "494",

pages = "750--763",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

Eisner, NL, Barragán, O, Aigrain, S, Lintott, C, Miller, G, Zicher, N, Boyajian, TS, Briceño, C, Bryant, EM, Christiansen, JL, Feinstein, AD, Flor-Torres, LM, Fridlund, M, Gandolfi, D, Gilbert, J, Guerrero, N, Jenkins, JM, Jones, K, Kristiansen, MH, Vanderburg, A, Law, N, López-Sánchez, AR, Mann, AW, Safron, EJ, Schwamb, ME, Stassun, KG, Osborn, HP, Wang, J, Zic, A, Ziegler, C, Barnet, F, Bean, SJ, Bundy, DM, Chetnik, Z, Dawson, JL, Garstone, J, Stenner, AG, Huten, M, Larish, S, Melanson, LD, Mitchell, T, Moore, C, Peltsch, K, Rogers, DJ, Schuster, C, Smith, DS, Simister, DJ, Tanner, C, Terentev, I & Tsymbal, A 2020, 'Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit', Monthly Notices of the Royal Astronomical Society, vol. 494, no. 1, pp. 750-763. https://doi.org/10.1093/mnras/staa138

TY - JOUR

T1 - Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit

AU - Eisner, N. L.

AU - Barragán, O.

AU - Aigrain, S.

AU - Lintott, C.

AU - Miller, G.

AU - Zicher, N.

AU - Boyajian, T. S.

AU - Briceño, C.

AU - Bryant, E. M.

AU - Christiansen, J. L.

AU - Feinstein, A. D.

AU - Flor-Torres, L. M.

AU - Fridlund, M.

AU - Gandolfi, D.

AU - Gilbert, J.

AU - Guerrero, N.

AU - Jenkins, J. M.

AU - Jones, K.

AU - Kristiansen, M. H.

AU - Vanderburg, A.

AU - Law, N.

AU - López-Sánchez, A. R.

AU - Mann, A. W.

AU - Safron, E. J.

AU - Schwamb, M. E.

AU - Stassun, K. G.

AU - Osborn, H. P.

AU - Wang, J.

AU - Zic, A.

AU - Ziegler, C.

AU - Barnet, F.

AU - Bean, S. J.

AU - Bundy, D. M.

AU - Chetnik, Z.

AU - Dawson, J. L.

AU - Garstone, J.

AU - Stenner, A. G.

AU - Huten, M.

AU - Larish, S.

AU - Melanson, L. D.

AU - Mitchell, T.

AU - Moore, C.

AU - Peltsch, K.

AU - Rogers, D. J.

AU - Schuster, C.

AU - Smith, D. S.

AU - Simister, D. J.

AU - Tanner, C.

AU - Terentev, I.

AU - Tsymbal, A.

PY - 2020/5/1

Y1 - 2020/5/1

N2 - We report on the discovery and validation of TOI 813 b (TIC 55525572 b), a transiting exoplanet identified by citizen scientists in data from NASA's Transiting Exoplanet Survey Satellite (TESS) and the first planet discovered by the Planet Hunters TESS project. The host star is a bright (V = 10.3 mag) subgiant (R\star - 1.94 R⊙, M\star = 1.32 M⊙). It was observed almost continuously by TESS during its first year of operations, during which time four individual transit events were detected. The candidate passed all the standard light curve-based vetting checks, and ground-based follow-up spectroscopy and speckle imaging enabled us to place an upper limit of 2 MJup (99 per cent confidence) on the mass of the companion, and to statistically validate its planetary nature. Detailed modelling of the transits yields a period of 83.8911-0.0031+0.0027 d, a planet radius of 6.71 ± 0.38 R⊕ and a semimajor axis of 0.423-0.037+0.031 AU. The planet's orbital period combined with the evolved nature of the host star places this object in a relatively underexplored region of parameter space. We estimate that TOI 813 b induces a reflex motion in its host star with a semi-amplitude of ∼6 m s-1, making this a promising system to measure the mass of a relatively long-period transiting planet.

AB - We report on the discovery and validation of TOI 813 b (TIC 55525572 b), a transiting exoplanet identified by citizen scientists in data from NASA's Transiting Exoplanet Survey Satellite (TESS) and the first planet discovered by the Planet Hunters TESS project. The host star is a bright (V = 10.3 mag) subgiant (R\star - 1.94 R⊙, M\star = 1.32 M⊙). It was observed almost continuously by TESS during its first year of operations, during which time four individual transit events were detected. The candidate passed all the standard light curve-based vetting checks, and ground-based follow-up spectroscopy and speckle imaging enabled us to place an upper limit of 2 MJup (99 per cent confidence) on the mass of the companion, and to statistically validate its planetary nature. Detailed modelling of the transits yields a period of 83.8911-0.0031+0.0027 d, a planet radius of 6.71 ± 0.38 R⊕ and a semimajor axis of 0.423-0.037+0.031 AU. The planet's orbital period combined with the evolved nature of the host star places this object in a relatively underexplored region of parameter space. We estimate that TOI 813 b induces a reflex motion in its host star with a semi-amplitude of ∼6 m s-1, making this a promising system to measure the mass of a relatively long-period transiting planet.

KW - methods: statistical

KW - planets and satellites: detection

KW - stars: fundamental parameters

KW - stars: individual (TIC-55525572

KW - TOI 813)

U2 - 10.1093/mnras/staa138

DO - 10.1093/mnras/staa138

M3 - Article

SN - 0035-8711

VL - 494

SP - 750

EP - 763

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit

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Keywords

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