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

^*Corresponding author for this work

Australian Astronomical Optics

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Abstract

We report on the discovery and validation of TOI 813 b (TIC55525572b), 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_* = 1.94 R_☉, M_☉ = 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 M_Jup (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^+0.0027_-0.0031 d, a planet radius of 6.71 ± 0.38 R_⊕ and a semimajor axis of 0.423⁺⁰⁰³¹_-0.037 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
Number of pages	14
Journal	Monthly Notices of the Royal Astronomical Society
Volume	494
Issue number	1
DOIs	https://doi.org/10.1093/mnras/staa138
Publication status	Published - 1 May 2020

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 494, Issue 1, May 2020, Pages 750–763, https://doi.org/10.1093/mnras/staa138. Copyright 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Keywords

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

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10.1093/mnras/staa138

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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{57833f971dc846c78a60553d2f9034b5,

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 (TIC55525572b), 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* = 1.94 R☉, M☉ = 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+0.0027-0.0031 d, a planet radius of 6.71 ± 0.38 R⊕ and a semimajor axis of 0.423+0031-0.037 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",

note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 494, Issue 1, May 2020, Pages 750–763, https://doi.org/10.1093/mnras/staa138. Copyright 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.",

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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

T2 - 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.

N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 494, Issue 1, May 2020, Pages 750–763, https://doi.org/10.1093/mnras/staa138. Copyright 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

PY - 2020/5/1

Y1 - 2020/5/1

N2 - We report on the discovery and validation of TOI 813 b (TIC55525572b), 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* = 1.94 R☉, M☉ = 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+0.0027-0.0031 d, a planet radius of 6.71 ± 0.38 R⊕ and a semimajor axis of 0.423+0031-0.037 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 (TIC55525572b), 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* = 1.94 R☉, M☉ = 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+0.0027-0.0031 d, a planet radius of 6.71 ± 0.38 R⊕ and a semimajor axis of 0.423+0031-0.037 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 - TOI 813)

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U2 - 10.1093/mnras/staa138

DO - 10.1093/mnras/staa138

M3 - Article

AN - SCOPUS:85085389075

SN - 0035-8711

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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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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