文章基本信息

标题：An Astrometric Planetary Companion Candidate to the M9 Dwarf TVLM 513–46546
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作者：Salvador Curiel ; Gisela N.Ortiz-León ; Amy J.Mioduszewski 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：160
期号：3
页码：1-12
DOI：10.3847/1538-3881/ab9e6e
语种：English
出版社：American Institute of Physics
摘要：Astrometric observations of the M9 dwarf TVLM 513–46546 taken with the VLBA reveal an astrometric signature consistent with a period of 221 ± 5 days. The orbital fit implies that the companion has a mass mp = 0.35−0.42 MJ, a circular orbit (e ; 0), a semimajor axis a = 0.28−0.31 au, and an inclination angle i = 71°−88°. The detected companion, TVLM 513b, is one of the few giant-mass planets found associated with ultracool dwarfs. The presence of a Saturn-like planet on a circular orbit 0.3 au from a 0.06−0.08 Me star represents a challenge to planet formation theory. This is the first astrometric detection of a planet at radio wavelengths.