Planet Hunters TESS III: Two transiting planets around the bright G dwarf HD 152843

N. L. Eisner; B. A. Nicholson; O. Barragán; S. Aigrain; C. Lintott; L. Kaye; B. Klein; G. Miller; J. Taylor; N. Zicher; L. A. Buchhave; D. A. Caldwell; J. Horner; J. Llama; A. Mortier; V. M. Rajpaul; K. Stassun; A. Sporer; A. Tkachenko; J. M. Jenkins; D. Latham; G. Ricker; S. Seager; J. Winn; S. Alhassan; E. M.L. Baeten; S. J. Bean; D. M. Bundy; V. Efremov; R. Ferstenou; B. L. Goodwin; M. Hof; T. Hoffman; A. Hubert; L. Lau; S. Lee; D. Maetschke; K. Peltsch; C. Rubio-Alfaro; G. M. Wilson

doi:10.1093/mnras/stab1253

Planet Hunters TESS III: Two transiting planets around the bright G dwarf HD 152843

N. L. Eisner, B. A. Nicholson, O. Barragán, S. Aigrain, C. Lintott, L. Kaye, B. Klein, G. Miller, J. Taylor, N. Zicher, L. A. Buchhave, D. A. Caldwell, J. Horner, J. Llama, A. Mortier, V. M. Rajpaul, K. Stassun, A. Sporer, A. Tkachenko, J. M. JenkinsD. Latham, G. Ricker, S. Seager, J. Winn, S. Alhassan, E. M.L. Baeten, S. J. Bean, D. M. Bundy, V. Efremov, R. Ferstenou, B. L. Goodwin, M. Hof, T. Hoffman, A. Hubert, L. Lau, S. Lee, D. Maetschke, K. Peltsch, C. Rubio-Alfaro, G. M. Wilson

Astrophysical Sciences

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Abstract

We report on the discovery and validation of a two-planet system around a bright (V = 8.85 mag) early G dwarf (1.43 R⊙, 1.15 M⊙, TOI 2319) using data from NASA's Transiting Exoplanet Survey Satellite (TESS). Three transit events from two planets were detected by citizen scientists in the month-long TESS light curve (sector 25), as part of the Planet Hunters TESS project. Modelling of the transits yields an orbital period of $11.6264 _{ - 0.0025 } ^ { + 0.0022 }$ d and radius of $3.41 _{ - 0.12 } ^ { + 0.14 }$ R⊕ for the inner planet, and a period in the range 19.26-35 d and a radius of $5.83 _{ - 0.14 } ^ { + 0.14 }$ R⊕ for the outer planet, which was only seen to transit once. Each signal was independently statistically validated, taking into consideration the TESS light curve as well as the ground-based spectroscopic follow-up observations. Radial velocities from HARPS-N and EXPRES yield a tentative detection of planet b, whose mass we estimate to be $11.56 _{ - 6.14 } ^ { + 6.58 }$ M⊕, and allow us to place an upper limit of 27.5 M⊕ (99 per cent confidence) on the mass of planet c. Due to the brightness of the host star and the strong likelihood of an extended H/He atmosphere on both planets, this system offers excellent prospects for atmospheric characterization and comparative planetology.

Original language	English (US)
Pages (from-to)	1827-1840
Number of pages	14
Journal	Monthly Notices of the Royal Astronomical Society
Volume	505
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stab1253
State	Published - Aug 1 2021

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

methods: statistical
planets and satellites: detection
stars: fundamental parameters
stars: individual: TIC 349488688, HD 152843

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10.1093/mnras/stab1253

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Eisner, N. L., Nicholson, B. A., Barragán, O., Aigrain, S., Lintott, C., Kaye, L., Klein, B., Miller, G., Taylor, J., Zicher, N., Buchhave, L. A., Caldwell, D. A., Horner, J., Llama, J., Mortier, A., Rajpaul, V. M., Stassun, K., Sporer, A., Tkachenko, A., ... Wilson, G. M. (2021). Planet Hunters TESS III: Two transiting planets around the bright G dwarf HD 152843. Monthly Notices of the Royal Astronomical Society, 505(2), 1827-1840. https://doi.org/10.1093/mnras/stab1253

@article{eef4036cf4ca445fb47d50c16a2a5376,

title = "Planet Hunters TESS III: Two transiting planets around the bright G dwarf HD 152843",

abstract = "We report on the discovery and validation of a two-planet system around a bright (V = 8.85 mag) early G dwarf (1.43 R⊙, 1.15 M⊙, TOI 2319) using data from NASA's Transiting Exoplanet Survey Satellite (TESS). Three transit events from two planets were detected by citizen scientists in the month-long TESS light curve (sector 25), as part of the Planet Hunters TESS project. Modelling of the transits yields an orbital period of $11.6264 _{ - 0.0025 } ^ { + 0.0022 }$ d and radius of $3.41 _{ - 0.12 } ^ { + 0.14 }$ R⊕ for the inner planet, and a period in the range 19.26-35 d and a radius of $5.83 _{ - 0.14 } ^ { + 0.14 }$ R⊕ for the outer planet, which was only seen to transit once. Each signal was independently statistically validated, taking into consideration the TESS light curve as well as the ground-based spectroscopic follow-up observations. Radial velocities from HARPS-N and EXPRES yield a tentative detection of planet b, whose mass we estimate to be $11.56 _{ - 6.14 } ^ { + 6.58 }$ M⊕, and allow us to place an upper limit of 27.5 M⊕ (99 per cent confidence) on the mass of planet c. Due to the brightness of the host star and the strong likelihood of an extended H/He atmosphere on both planets, this system offers excellent prospects for atmospheric characterization and comparative planetology.",

keywords = "methods: statistical, planets and satellites: detection, stars: fundamental parameters, stars: individual: TIC 349488688, HD 152843",

author = "Eisner, {N. L.} and Nicholson, {B. A.} and O. Barrag{\'a}n and S. Aigrain and C. Lintott and L. Kaye and B. Klein and G. Miller and J. Taylor and N. Zicher and Buchhave, {L. A.} and Caldwell, {D. A.} and J. Horner and J. Llama and A. Mortier and Rajpaul, {V. M.} and K. Stassun and A. Sporer and A. Tkachenko and Jenkins, {J. M.} and D. Latham and G. Ricker and S. Seager and J. Winn and S. Alhassan and Baeten, {E. M.L.} and Bean, {S. J.} and Bundy, {D. M.} and V. Efremov and R. Ferstenou and Goodwin, {B. L.} and M. Hof and T. Hoffman and A. Hubert and L. Lau and S. Lee and D. Maetschke and K. Peltsch and C. Rubio-Alfaro and Wilson, {G. M.}",

note = "Publisher Copyright: {\textcopyright} 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.",

year = "2021",

month = aug,

day = "1",

doi = "10.1093/mnras/stab1253",

language = "English (US)",

volume = "505",

pages = "1827--1840",

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

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

Eisner, NL, Nicholson, BA, Barragán, O, Aigrain, S, Lintott, C, Kaye, L, Klein, B, Miller, G, Taylor, J, Zicher, N, Buchhave, LA, Caldwell, DA, Horner, J, Llama, J, Mortier, A, Rajpaul, VM, Stassun, K, Sporer, A, Tkachenko, A, Jenkins, JM, Latham, D, Ricker, G, Seager, S, Winn, J, Alhassan, S, Baeten, EML, Bean, SJ, Bundy, DM, Efremov, V, Ferstenou, R, Goodwin, BL, Hof, M, Hoffman, T, Hubert, A, Lau, L, Lee, S, Maetschke, D, Peltsch, K, Rubio-Alfaro, C & Wilson, GM 2021, 'Planet Hunters TESS III: Two transiting planets around the bright G dwarf HD 152843', Monthly Notices of the Royal Astronomical Society, vol. 505, no. 2, pp. 1827-1840. https://doi.org/10.1093/mnras/stab1253

TY - JOUR

T1 - Planet Hunters TESS III

T2 - Two transiting planets around the bright G dwarf HD 152843

AU - Eisner, N. L.

AU - Nicholson, B. A.

AU - Barragán, O.

AU - Aigrain, S.

AU - Lintott, C.

AU - Kaye, L.

AU - Klein, B.

AU - Miller, G.

AU - Taylor, J.

AU - Zicher, N.

AU - Buchhave, L. A.

AU - Caldwell, D. A.

AU - Horner, J.

AU - Llama, J.

AU - Mortier, A.

AU - Rajpaul, V. M.

AU - Stassun, K.

AU - Sporer, A.

AU - Tkachenko, A.

AU - Jenkins, J. M.

AU - Latham, D.

AU - Ricker, G.

AU - Seager, S.

AU - Winn, J.

AU - Alhassan, S.

AU - Baeten, E. M.L.

AU - Bean, S. J.

AU - Bundy, D. M.

AU - Efremov, V.

AU - Ferstenou, R.

AU - Goodwin, B. L.

AU - Hof, M.

AU - Hoffman, T.

AU - Hubert, A.

AU - Lau, L.

AU - Lee, S.

AU - Maetschke, D.

AU - Peltsch, K.

AU - Rubio-Alfaro, C.

AU - Wilson, G. M.

PY - 2021/8/1

Y1 - 2021/8/1

N2 - We report on the discovery and validation of a two-planet system around a bright (V = 8.85 mag) early G dwarf (1.43 R⊙, 1.15 M⊙, TOI 2319) using data from NASA's Transiting Exoplanet Survey Satellite (TESS). Three transit events from two planets were detected by citizen scientists in the month-long TESS light curve (sector 25), as part of the Planet Hunters TESS project. Modelling of the transits yields an orbital period of $11.6264 _{ - 0.0025 } ^ { + 0.0022 }$ d and radius of $3.41 _{ - 0.12 } ^ { + 0.14 }$ R⊕ for the inner planet, and a period in the range 19.26-35 d and a radius of $5.83 _{ - 0.14 } ^ { + 0.14 }$ R⊕ for the outer planet, which was only seen to transit once. Each signal was independently statistically validated, taking into consideration the TESS light curve as well as the ground-based spectroscopic follow-up observations. Radial velocities from HARPS-N and EXPRES yield a tentative detection of planet b, whose mass we estimate to be $11.56 _{ - 6.14 } ^ { + 6.58 }$ M⊕, and allow us to place an upper limit of 27.5 M⊕ (99 per cent confidence) on the mass of planet c. Due to the brightness of the host star and the strong likelihood of an extended H/He atmosphere on both planets, this system offers excellent prospects for atmospheric characterization and comparative planetology.

AB - We report on the discovery and validation of a two-planet system around a bright (V = 8.85 mag) early G dwarf (1.43 R⊙, 1.15 M⊙, TOI 2319) using data from NASA's Transiting Exoplanet Survey Satellite (TESS). Three transit events from two planets were detected by citizen scientists in the month-long TESS light curve (sector 25), as part of the Planet Hunters TESS project. Modelling of the transits yields an orbital period of $11.6264 _{ - 0.0025 } ^ { + 0.0022 }$ d and radius of $3.41 _{ - 0.12 } ^ { + 0.14 }$ R⊕ for the inner planet, and a period in the range 19.26-35 d and a radius of $5.83 _{ - 0.14 } ^ { + 0.14 }$ R⊕ for the outer planet, which was only seen to transit once. Each signal was independently statistically validated, taking into consideration the TESS light curve as well as the ground-based spectroscopic follow-up observations. Radial velocities from HARPS-N and EXPRES yield a tentative detection of planet b, whose mass we estimate to be $11.56 _{ - 6.14 } ^ { + 6.58 }$ M⊕, and allow us to place an upper limit of 27.5 M⊕ (99 per cent confidence) on the mass of planet c. Due to the brightness of the host star and the strong likelihood of an extended H/He atmosphere on both planets, this system offers excellent prospects for atmospheric characterization and comparative planetology.

KW - methods: statistical

KW - planets and satellites: detection

KW - stars: fundamental parameters

KW - stars: individual: TIC 349488688, HD 152843

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UR - http://www.scopus.com/inward/citedby.url?scp=85128524572&partnerID=8YFLogxK

U2 - 10.1093/mnras/stab1253

DO - 10.1093/mnras/stab1253

M3 - Article

AN - SCOPUS:85128524572

SN - 0035-8711

VL - 505

SP - 1827

EP - 1840

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

Planet Hunters TESS III: Two transiting planets around the bright G dwarf HD 152843

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Keywords

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