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A compact multi-planet system around a bright nearby star from the Dispersed Matter Planet Project

Staab, D.; Haswell, C. A.; Barnes, J. R.; Anglada-Escudé, G.; Fossati, L.; Doherty, J. P. J.; Cooper, J.; Jenkins, J. S.; Díaz, M. R. and Soto, M. G. (2019). A compact multi-planet system around a bright nearby star from the Dispersed Matter Planet Project. Nature Astronomy (Early Access).

DOI (Digital Object Identifier) Link: https://doi.org/10.1038/s41550-019-0974-x
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Abstract

To put the Solar System’s terrestrial planets in context, the detection and characterization of low-mass exoplanets is important but challenging. The Dispersed Matter Planet Project targets stars with anomalously low Ca II H and K chromospheric emission, indicative of circumstellar absorbing gas. Here we report high-precision, high-cadence radial-velocity measurements of the F8V star DMPP-1 (HD 38677). These were motivated by depressed Ca II H and K line cores indicative of short-period, ablating planets producing circumstellar gas. We find a compact planetary system with orbital periods of about 2.9–19 days, comprising three super-Earth-mass planets (about 3–10 M) and one Neptune-mass planet (about 24 M). The irradiated super-Earths may be remnant cores of giant planets after mass loss while crossing the Neptune desert. A priori inferences about the presence of short-period planets enabled the efficient discovery of the DMPP-1 planets. We anticipate informative follow-up characterization studies.

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: 68637
Depositing User: ORO Import
Date Deposited: 24 Dec 2019 09:13
Last Modified: 19 May 2020 08:03
URI: http://oro.open.ac.uk/id/eprint/68637
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