Journal
ASTROPHYSICAL JOURNAL
Volume 869, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/aaec6a
Keywords
circumstellar matter; planetary systems; stars: individual (HD 105)
Categories
Funding
- Ministry of Science and Technology of Taiwan [MOST107-2119-M-001-031-MY3]
- NASA - STScI [HF2-51355]
- NASA [NAS5-26555, HST-AR-12652, HST-GO-11136, HST-GO-13855, HST-GO-13331]
- STScI Director's Discretionary Research funds
- Mexican CONACyT [CB-2012-183007]
- Royal Society
- Smithsonian Institution
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HD 105 is a nearby, pre-main-sequence GO star hosting a moderately bright debris disk (L-dust /L-star similar to 2.6 x 10(-4) ). The star and its surroundings might therefore be considered an analog of the young solar system. We refine the stellar parameters based on an improved Gaia parallax distance and identify it as a pre-main-sequence star with an age of 50 +/- 16 Myr. The circumstellar disk was marginally resolved by Herschel/PACS imaging at far-infrared wavelengths. Here, we present an archival ALMA observation at 1.3 mm, revealing the extent and orientation of the disk. We also present Hubble Space Telescope (HST)/NICMOS and VLT/SPHERE near-infrared images, where we recover the disk in scattered light at the >= 5 sigma level. This was achieved by employing a novel annular averaging technique and is the first time this has been achieved for a disk in scattered light. Simultaneous modeling of the available photometry, disk architecture, and detection in scattered light allow better determination of the disk's architecture, and dust grain minimum size, composition, and albedo. We measure the dust albedo to lie between 0.19 and 0.06, the lower value being consistent with Edgeworth-Kuiper Belt objects.
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