K2-140b – an eccentric 6.57 d transiting hot Jupiter in Virgo

Creators: Giles, H. A. C.; Shporer, A.; Jensen-Clem, R.; Duev, D. A.; Riddle, R.

Abstract

We present the discovery of K2-140b, a P = 6.57 d Jupiter-mass (M_P = 1.019 ± 0.070M_(Jup)) planet transiting a V = 12.5 (G5-spectral type) star in an eccentric orbit (e = 0.120^(+0.056)_(−0.046)) detected using a combination of K2 photometry and ground-based observations. With a radius of 1.095 ± 0.018 R_(Jup), the planet has a bulk density of 0.726 ± 0.062 ρ_(Jup). The host star has a [Fe/H] of 0.12 ± 0.045, and from the K2 light curve, we find a rotation period for the star of 16.3 ± 0.1 d. This discovery is the 9th hot Jupiter from K2 and highlights K2's ability to detect transiting giant planets at periods slightly longer than traditional, ground-based surveys. This planet is slightly inflated, but much less than others with similar incident fluxes. These are of interest for investigating the inflation mechanism of hot Jupiters.

Additional Information

© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 December 20. Received 2017 October 31; in original form 2017 June 21. Published: 05 January 2018. HACG, DB, CL, SU, FB and MM thank the Swiss National Science Foundation (SNSF) and the Geneva University for their continuous support to our planet search programs. This work has been in particular carried out in the frame of the National Centre for Competence in Research 'PlanetS' supported by the Swiss National Science Foundation (SNSF). NE acknowledges support from Financiamiento Basal PFB06. RB, NE, and AJ acknowledge support from the Ministry for the Economy, Development and Tourism Programa Iniciativa Científica Milenio through grant IC 120009, awarded to the Millenium Institute of Astrophysics. AJ acknowledges support by Fondecyt grant 1171208 and partial support by CATA-Basal (PB06, CONICYT). JSJ acknowledges support by Fondecyt grant 1161218 and partial support by CATA-Basal (PB06, CONICYT). This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research was made possible through the use of the AAVSO Photometric All-Sky Survey (APASS), funded by the Robert Martin Ayers Sciences Fund. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. Some/all of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. This paper includes data collected by the Kepler mission. Funding for the Kepler mission is provided by the NASA Science Mission directorate. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. This work makes use of observations from the LCO network. The Robo-AO team thanks NSF and NOAO for making the Kitt Peak 2.1-m telescope available. We thank the observatory staff at Kitt Peak for their efforts to assist Robo-AO KP operations. Robo-AO KP is a partnership between the California Institute of Technology, the University of Hawai'i, the University of North Carolina at Chapel Hill, the Inter-University Centre for Astronomy and Astrophysics (IUCAA) at Pune, India, and the National Central University, Taiwan. The Murty family feels very happy to have added a small value to this important project. Robo-AO KP is also supported by grants from the John Templeton Foundation and the Mt. Cuba Astronomical Foundation. The Robo-AO instrument was developed with support from the National Science Foundation under grants AST-0906060, AST-0960343, and AST-1207891, IUCAA, the Mt. Cuba Astronomical Foundation, and by a gift from Samuel Oschin. These data are based on observations at Kitt Peak National Observatory, National Optical Astronomy Observatory (NOAO Prop. ID: 15B-3001), which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation. CB acknowledges support from the Alfred P. Sloan Foundation. ACC acknowledges support from STFC consolidated grant number ST/M001296/1. DA acknowledges support from STFC consolidated grant reference ST/P000495/1. This research has made use of the SIMBAD data base and of the VizieR catalogue access tool operated at CDS, France, and used the DACE platform developed in the frame of PlanetS (https://dace.unige.ch).

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