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

We present the discovery of K2-140b, a P = 6.57 d Jupiter-mass (MP = 1.019 ± 0.070MJup) 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 ± 0.018RJup, the planet has a bulk density of 0.726 ± 0.062ρJup. 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 ± 0.1d. 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.

Citation

Giles , H A C , Bayliss , D , Espinoza , N , Brahm , R , Blanco-Cuaresma , S , Shporer , A , Armstrong , D , Lovis , C , Udry , S , Bouchy , F , Marmier , M , Jordán , A , Bento , J , Cameron , A C , Sefako , R , Cochran , W D , Rojas , F , Rabus , M , Jenkins , J S , Jones , M , Pantoja , B , Soto , M , Jensen-Clem , R , Duev , D A , Salama , M , Riddle , R , Baranec , C & Law , N M 2018 , ' K2-140b - an eccentric 6.57 d transiting hot Jupiter in Virgo ' , Monthly Notices of the Royal Astronomical Society , vol. 475 , no. 2 , pp. 1809-1818 . https://doi.org/10.1093/mnras/stx3300

Publication

Monthly Notices of the Royal Astronomical Society

Status

Peer reviewed

DOI

https://doi.org/10.1093/mnras/stx3300

ISSN

0035-8711

Type

Journal article

Rights

© 2018, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stx3300

Description

Funding: STFC consolidated grant number ST/M001296/1 (ACC)