A compact multi-planet system around a bright nearby star from the Dispersed Matter Planet Project
D. Staab, C.A. Haswell, J.R. Barnes, G. Anglada-Escud\'e, L. Fossati,, J.P.J. Doherty, J. Cooper, J.S. Jenkins, M.R. D\'iaz, M.G. Soto

TL;DR
This study reports the discovery of four short-period, compact planets around a bright star, using high-precision radial velocity measurements, highlighting a potential link to circumstellar gas and planetary evolution.
Contribution
First detection of a multi-planet system around a star with low chromospheric activity using the Dispersed Matter Planet Project.
Findings
Four short-period planets identified around HD 38677
Planets range from super-Earth to Neptune mass
Potentially remnant cores of former giant planets
Abstract
The Dispersed Matter Planet Project targets stars with anomalously low Ca II H&K chromospheric emission. High precision, high cadence radial velocity measurements of the F8V star HD 38677 / DMPP-1 reveal four short period planets. DMPP-1 has log(R'HK) = -5.16 which probably indicates the presence of circumstellar absorbing gas arising from an ablating hot planet. The planets have P ~ 2.9 - 19 d, i.e., a compact planetary system with super-Earth (~3 M) to Neptune-mass (~24 M) planets. These irradiated planets may be chthonian: remnant cores of giant planets after mass-loss while crossing the Neptune desert. Modelling the possible long-term activity indicators while searching for Keplerian signals modifies the recovered planetary signals. A priori inferences about the presence of short period planets allowed the efficient discovery of the DMPP-1 planets. They…
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