A mini-TRAPPIST-1 system around Barnard’s Star

IF 12.9 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Nature Astronomy Pub Date : 2025-04-14 DOI:10.1038/s41550-025-02543-5

Luca Maltagliati

引用次数: 0

Abstract

Barnard’s Star is one of the closest and most studied M dwarfs, and various attempts have been undertaken to determine whether it hosts planets. Despite these efforts, the first exoplanetary detection came only in 2024 by radial velocity data from the ESPRESSO spectrograph on the VLT (J. I. González Hernández et al. Astron. Astrophys. 690, A79; 2024). The same study found three other unconfirmed signals. Armed with this knowledge, Ritvik Basant and colleagues revisited the system.

The authors analyse data obtained by another spectrograph, MAROON-X at Gemini North, first separately then jointly with the ESPRESSO data, allowing the detection of radial velocity signals less than 50 cm s^–1. They confirm the presence of four planets in a very compact configuration: the innermost planet has a period of 2.34 days and the outermost one of 6.74 days. Remarkably, all have very small minimum masses, between 0.19 and 0.34 M_⊕.

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来源期刊

Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics

CiteScore

19.50

自引率

2.80%

发文量

252

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