Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit. Issue 1 (23rd January 2020)
- Record Type:
- Journal Article
- Title:
- Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit. Issue 1 (23rd January 2020)
- Main Title:
- Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit
- Authors:
- 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
Vanderburg, A
Law, N
López-Sánchez, A R
Mann, A W
Safron, E J
Schwamb, M E
Stassun, K G
Osborn, H P
Wang, J
Zic, A
Ziegler, C
Barnet, F
Bean, S J
Bundy, D M
Chetnik, Z
Dawson, J L
Garstone, J
Stenner, A G
Huten, M
Larish, S
Melanson, L D
Mitchell, T
Moore, C
Peltsch, K
Rogers, D J
Schuster, C
Smith, D S
Simister, D J
Tanner, C
Terentev, I
Tsymbal, A
… (more) - Abstract:
- 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 ($R_\star =1.94\, R_\odot$, $M_\star =1.32\, M_\odot$ ). 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 $2\, M_{\rm Jup}$ (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 $83.8911 _{ - 0.0031 } ^ { + 0.0027 }$ 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.
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 494:Issue 1(2020)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 494:Issue 1(2020)
- Issue Display:
- Volume 494, Issue 1 (2020)
- Year:
- 2020
- Volume:
- 494
- Issue:
- 1
- Issue Sort Value:
- 2020-0494-0001-0000
- Page Start:
- 750
- Page End:
- 763
- Publication Date:
- 2020-01-23
- Subjects:
- methods: statistical -- planets and satellites: detection -- stars: fundamental parameters -- stars: individual (TIC-55525572 -- TOI 813)
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/staa138 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 15131.xml