期刊
ASTROPHYSICAL JOURNAL
卷 922, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac19a8
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资金
- NASA ADAP grant [18-ADAP18-0233]
- APS M. Hildred Blewett Fellowship
- NSF [AST-1517655]
- W.M. Keck Foundation
- NASA
We characterized the planetary system architecture for V488 Per, the dustiest main-sequence star known, confirming the presence of both outer and inner planetary system dust populations. Analysis of mid-infrared spectroscopy suggests the possibility of large grain sizes or grain compositions dominated by species like amorphous carbon and metallic iron. The absence of solid-state emission features in the mid-infrared spectrum is very unusual among main-sequence stars with warm orbiting dust particles.
We present characterization of the planetary system architecture for V488 Per, the dustiest main-sequence star known with a fractional infrared luminosity of approximate to 16%. Far-infrared imaging photometry confirms the existence of an outer planetary system dust population with a blackbody-fit temperature of approximate to 130 K. Mid-infrared spectroscopy probing the previously identified approximate to 800 K inner planetary system dust population does not detect any obvious solid-state emission features, suggesting either large grain sizes that mute such emission and/or grain compositions dominated by species like amorphous carbon and metallic iron, which do not produce such features. In the latter case, the presence of significant quantities of iron-rich material could be indicative of the active formation of a Mercury-like planet around V488 Per. In any event, the absence of solid-state emission features is very unusual among main-sequence stars with copious amounts of warm orbiting dust particles; we know of no other such star whose mid-infrared spectrum lacks such features. Combined radial velocity monitoring and adaptive optics imaging find no evidence for stellar/substellar companions within several hundred astronomical units of V488 Per.
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