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Evidence of Accretion Burst: The Viscously Heated Inner Disk of the Embedded Protostar IRAS 16316-1540
- Publication Year :
- 2021
-
Abstract
- Outbursts of young stellar objects occur when the mass accretion rate suddenly increases. However, such outbursts are difficult to detect for deeply embedded protostars due to their thick envelope and the rarity of outbursts. The near-IR spectroscopy is a useful tool to identify ongoing outburst candidates by the characteristic absorption features that indicate a disk origin. However, without high-resolution spectroscopy, the spectra of outburst candidates can be confused with the late-type stars since they have similar spectral features. For the protostar IRAS 16316-1540, the near-IR spectrum has line equivalent widths that are consistent with M-dwarf photospheres. However, our high-resolution IGRINS spectra reveal that the absorption lines have boxy and/or double-peaked profiles, as expected from a disk and not the star. The continuum emission source is likely the hot, optically thick disk, heated by viscous accretion. The projected disk rotation velocity of 41$\pm$5 km s$^{-1}$ corresponds to $\sim 0.1$ AU. Based on the result, we suggest IRAS 16316-1540 as an ongoing outburst candidate. Viscous heating of disks is usually interpreted as evidence for ongoing bursts, which may be more common than previously estimated from low-resolution near-IR spectra.<br />13 pages, 6 figures, Accepted for publication in ApJ
- Subjects :
- Physics
010308 nuclear & particles physics
Young stellar object
Astrophysics::High Energy Astrophysical Phenomena
Continuum (design consultancy)
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Accretion (astrophysics)
Spectral line
Stars
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
0103 physical sciences
Thick disk
Protostar
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
Line (formation)
Subjects
Details
- Language :
- English
- ISSN :
- 63161540
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....7347b7b6d411bd1f77a2663ba674a84a