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An ablating 2.6 M planet in an eccentric binary from the Dispersed Matter Planet Project

Barnes, John R,; Haswell, Carole A.; Staab, Daniel; Anglada-Escudé, Guillem; Fossati, Luca; Doherty, James P. J.; Cooper, Joseph; Jenkins, James S.; Díaz, Matías R.; Soto, Maritza G. and Peña Rojas, Pablo A. (2019). An ablating 2.6 M planet in an eccentric binary from the Dispersed Matter Planet Project. Nature Astronomy (Early Access).

DOI (Digital Object Identifier) Link: https://doi.org/10.1038/s41550-019-0972-z
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Abstract

Earth-mass exoplanets are difficult to detect. The Dispersed Matter Planet Project (DMPP) identifies stars that are likely to host the most detectable low-mass exoplanets. The star DMPP-3 (HD 42936) shows signs of circumstellar absorption, indicative of mass loss from ablating planets. Here, we report the radial velocity discovery of a highly eccentric 507 d binary companion and a hot super-Earth-mass planet in a 6.67 d orbit around the primary star. DMPP-3A is a solar-type star while DMPP-3B is just massive enough to fuse hydrogen. The binary, with semi-major axis 1.22 ± 0.02 au, is considerably tighter than others known to host planets orbiting only one of the component stars. The configuration of the DMPP-3 planetary system is rare and indicates dynamical interactions, though the evolutionary history is not entirely clear. DMPP-3A b is possibly the residual core of a giant planet precursor, consistent with the inferred circumstellar gas shroud.

Item Type: Journal Item
ISSN: 2397-3366
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
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Item ID: 68638
Depositing User: ORO Import
Date Deposited: 24 Dec 2019 09:13
Last Modified: 19 Feb 2020 10:11
URI: http://oro.open.ac.uk/id/eprint/68638
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