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An Eccentric Massive Jupiter Orbiting a Subgiant on a 9.5-day Period Discovered in the Transiting Exoplanet Survey Satellite Full Frame Images

Rodriguez, Joseph E. and Christiansen, Jessie and Ciardi, David R. (2019) An Eccentric Massive Jupiter Orbiting a Subgiant on a 9.5-day Period Discovered in the Transiting Exoplanet Survey Satellite Full Frame Images. Astronomical Journal, 157 (5). Art. No. 191. ISSN 1538-3881. doi:10.3847/1538-3881/ab11d9.

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We report the discovery of TOI-172 b from the Transiting Exoplanet Survey Satellite (TESS) mission, a massive hot Jupiter transiting a slightly evolved G star with a 9.48-day orbital period. This is the first planet to be confirmed from analysis of only the TESS full frame images, because the host star was not chosen as a two-minute cadence target. From a global analysis of the TESS photometry and follow-up observations carried out by the TESS Follow-up Observing Program Working Group, TOI-172 (TIC 29857954) is a slightly evolved star with an effective temperature of T_(eff) = 5645 ± 50 K, a mass of M⋆ = 1.128^(+0.065)_(−0.061) M⊙, radius of R⋆ = 1.777^(+0.047)_(−0.044) R⊙, a surface gravity of log g⋆ = 3.993^(+0.027)_(−0.028), and an age of 7.4^(+1.6)_(−1.5) Gyr. Its planetary companion (TOI-172 b) has a radius of R_P = 0.965^(+0.032)_(−0.029) R_J, a mass of M_P = 5.42^(+0.22)_(−0.20) M_J, and is on an eccentric orbit (e=0.3806^(+0.0093)_(−0.009)). TOI-172 b is one of the few known massive giant planets on a highly eccentric short-period orbit. Future study of the atmosphere of this planet and its system architecture offer opportunities to understand the formation and evolution of similar systems.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Rodriguez, Joseph E.0000-0001-8812-0565
Christiansen, Jessie0000-0002-8035-4778
Ciardi, David R.0000-0002-5741-3047
Additional Information:© 2019 The American Astronomical Society. Received 2019 January 28; revised 2019 March 15; accepted 2019 March 18; published 2019 April 29. Facilities: TESS, FLWO 1.5 m (Tillinghast Reflector Echelle Spectrograph), 4.1-m Southern Astrophysical Research (SOAR), LCO 0.4 m, LCO 1.0 m, 2.2 m telescope La Silla (Fiber-fed Extended Range Optical Spectrograph). Software: EXOFASTv2 (Eastman et al. 2013; Eastman 2017), AstroImageJ (Collins et al. 2017). We thank Laura Kreidburg and Laura Mayorga for their valuable conversations. J.E.R. was supported by the Harvard Future Faculty Leaders Postdoctoral fellowship. A.V.'s contribution to this work was performed under contract with the California Institute of Technology (Caltech)/Jet Propulsion Laboratory (JPL) funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. C,Z, is supported by a Dunlap Fellowship at the Dunlap Institute for Astronomy & Astrophysics, funded through an endowment established by the Dunlap family and the University of Toronto. C.X.H., J.A.B., and M.N.G. acknowledge support from MITs Kavli Institute as Torres postdoctoral fellows. D.D. acknowledges support for this work provided by NASA through Hubble Fellowship grant HST-HF2-51372.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. T.D. acknowledges support from MITs Kavli Institute as a Kavli postdoctoral fellow. R.B. acknowledges support from FONDECYT Postdoctoral Fellowship Project 3180246, and from the Millennium Institute of Astrophysics (MAS). A.J. acknowledges support from FONDECYT project 1171208, CONICYT project BASAL AFB-170002, and by the Ministry for the Economy, Development, and Tourism's Programa Iniciativa Científica Milenio through grant IC 120009, awarded to the Millennium Institute of Astrophysics (MAS). This research has made use of SAO/NASA's Astrophysics Data System Bibliographic Services. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. This work has made use of data from the European Space Agency (ESA) mission Gaia (, processed by the Gaia Data Processing and Analysis Consortium (DPAC; Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This work makes use of observations from the LCO network. Funding for the TESS mission is provided by NASA's Science Mission directorate. We acknowledge the use of public TESS alert data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. This research has made use of the NASA Exoplanet Archive and the Exoplanet Follow-up Observation Program website, which are operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. This paper includes data collected by the TESS mission, which are publicly available from the Mikulski Archive for Space Telescopes (MAST). This paper includes observations obtained under Gemini program GN-2018B-LP-101. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Harvard UniversityUNSPECIFIED
Dunlap Institute for Astronomy and AstrophysicsUNSPECIFIED
University of TorontoUNSPECIFIED
Massachusetts Institute of Technology (MIT)UNSPECIFIED
NASA Hubble FellowshipHST-HF2-51372.001-A
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)3180246
Millennium Institute of Astrophysics (MAS)UNSPECIFIED
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1171208
Ministerio de Economía Fomento y TurismoIC 120009
Gaia Multilateral AgreementUNSPECIFIED
Subject Keywords:planetary systems – planets and satellites: detection – stars: individual (TIC 29857954)
Issue or Number:5
Record Number:CaltechAUTHORS:20190429-140443129
Persistent URL:
Official Citation:Joseph E. Rodriguez et al 2019 AJ 157 191
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95075
Deposited By: Tony Diaz
Deposited On:29 Apr 2019 21:21
Last Modified:16 Nov 2021 17:10

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