RedDots: Multiplanet system around M dwarf GJ 887 in the solar neighborhood
C. Hartogh, S. V. Jeffers, S. Dreizler, J. R. Barnes, C. A. Haswell, F. Liebing, A. Collier Cameron, P. Gorrini, F. Del Sordo, and P. Cort\'es-Zuleta

TL;DR
This study confirms a four-planet system around M dwarf GJ 887, including two new planets in the habitable zone, using extensive radial velocity data and advanced statistical modeling to distinguish planetary signals from stellar activity.
Contribution
The paper presents the first confirmation of two additional exoplanets around GJ 887, including a habitable-zone super-Earth, using combined HARPS and ESPRESSO data with Gaussian process modeling.
Findings
Confirmed four planets around GJ 887, including two new ones.
Detected a super-Earth in the habitable zone.
Identified a potential additional planet candidate.
Abstract
GJ 887 is a bright M dwarf in the solar neighborhood with two currently reported nontransiting exoplanets with periods of and along with an additional unconfirmed signal at . We reanalyzed the system with 101 new HARPS and 12 new ESPRESSO radial velocities (RVs) secured with a cadence to confirm or refute the origin of the signal. To do so, we searched for signals related to stellar activity in photometric data and spectroscopic indicators. We modeled the stellar activity in the RVs with Gaussian processes (GPs). With the Bayesian analysis, we confirmed a four-planet model, including the two previously known planets at periods of and as well as two newly confirmed exoplanets: an Earth-mass planet, with a period and a sub-meter-per-second…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Scientific Research and Discoveries
