The Solar Twin Planet Search II. A Jupiter twin around a solar twin
M. Bedell, J. Melendez, J. L. Bean, I. Ramirez, M. Asplund, A., Alves-Brito, L. Casagrande, S. Dreizler, T. Monroe, L. Spina, and M. Tucci, Maia

TL;DR
This paper reports the detection of a Jupiter-like exoplanet around a solar twin star using radial velocity data, highlighting the challenges of confirming long-period signals and the potential for discovering solar system analogs.
Contribution
It presents the identification and analysis of a Jupiter twin candidate around a solar twin star, demonstrating methods to distinguish planetary signals from stellar activity.
Findings
Detected a Jupiter-mass planet with a 3800-day orbit
The signal is more likely planetary than stellar activity
Highlights importance of long-term RV monitoring for exoplanet discovery
Abstract
Through our HARPS radial velocity survey for planets around solar twin stars, we have identified a promising Jupiter twin candidate around the star HIP11915. We characterize this Keplerian signal and investigate its potential origins in stellar activity. Our analysis indicates that HIP11915 hosts a Jupiter-mass planet with a 3800-day orbital period and low eccentricity. Although we cannot definitively rule out an activity cycle interpretation, we find that a planet interpretation is more likely based on a joint analysis of RV and activity index data. The challenges of long-period radial velocity signals addressed in this paper are critical for the ongoing discovery of Jupiter-like exoplanets. If planetary in nature, the signal investigated here represents a very close analog to the solar system in terms of both Sun-like host star and Jupiter-like planet.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astro and Planetary Science · Scientific Research and Discoveries
