A Jovian planet in an eccentric 11.5 day orbit around HD 1397 discovered by TESS

Nielsen, L. D. and Bouchy, F. and Turner, O. and Giles, H. and Suarez Mascareno, A. and Lovis, C. and Marmier, M. and Pepe, F. and Segransan, D. and Udry, S. and Otegi, J. F. and Ottoni, G. and Staport, M. and Ricker, G. and Vanderspek, R. and Latham, D. W. and Seager, S. and Winn, J. N. and Jenkins, J. M. and Kane, S. R. and Wittenmyer, R. A. and Bowler, B. and Crossfield, I. and Horner, J. and Kielkopf, J. and Morton, T. and Plavchan, P. and Tinney, C. G. and Zhang, Hui and Wright, D. J. and Mengel, M. W. and Clark, J. T. and Okumura, J. and Addison, B. and Caldwell, D. A. and Cartwright, S. M. and Collins, K. A. and Francis, J. and Guerrero, N. and Huang, C. X. and Matthews, E. C. and Pepper, J. and Rose, M. and Villasenor, J. and Wohler, B. and Stassun, K. and Howell, S. and Ciardi, D. and Gonzales, E. and Matson, R. and Beichman, C. and Schlieder, J. (2019) A Jovian planet in an eccentric 11.5 day orbit around HD 1397 discovered by TESS. Astronomy and Astrophysics, 623 (Article A100). ISSN 0004-6361

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Abstract

The Transiting Exoplanet Survey Satellite TESS has begun a new age of exoplanet discoveries around bright host stars. We present the discovery of HD 1397b (TOI-120.01), a giant planet in an 11.54-day eccentric orbit around a bright (V = 7.9) G-type subgiant. We estimate both host star and planetary parameters consistently using EXOFASTv2 based on TESS time-series photometry of transits and radial velocity measurements with CORALIE and MINERVA-Australis. We also present high angular resolution imaging with NaCo to rule out any nearby eclipsing binaries. We find that HD 1397b is a Jovian planet, with a mass of 0.415 ± 0.020 MJ and a radius of 1.026 ± 0.026 RJ. Characterising giant planets in short-period eccentric orbits, such as HD 1397b, is important for understanding and testing theories for the formation and migration of giant planets as well as planet-star interactions.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to Published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 09 Sep 2019 03:13
Last Modified: 10 Sep 2019 04:50
Uncontrolled Keywords: planets and satellites, detection HD 1397b, TOI-120, 394137592
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Identification Number or DOI: 10.1051/0004-6361/20183457
URI: http://eprints.usq.edu.au/id/eprint/36919

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