Evolution from protoplanetary to debris discs: the transition disc around HD 166191

Kennedy, G. M. and Murphy, S. J. and Lisse, C. M. and Menard, F. and Sitko, M. L. and Wyatt, M. C. and Bayliss, D. D. R. and DeMeo, F. E. and Crawford, K. B. and Kim, D. L. and Rudy, R. J. and Russell, R. W. and Sibthorpe, B. and Skinner, M. A. and Zhou, G. ORCID: https://orcid.org/0000-0002-4891-3517 (2014) Evolution from protoplanetary to debris discs: the transition disc around HD 166191. Monthly Notices of the Royal Astronomical Society, 438 (4):stt2435. pp. 3299-3309. ISSN 0035-8711

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HD 166191 has been identified by several studies as hosting a rare and extremely bright warm debris disc with an additional outer cool disc component. However, an alternative interpretation is that the star hosts a disc that is currently in transition between a full gas disc and a largely gas-free debris disc. With the help of new optical to mid-infrared (IR) spectra and Herschel imaging, we argue that the latter interpretation is supported in several ways: (i) we show that HD 166191 is comoving with the ∼4-Myr-old Herbig Ae star HD 163296, suggesting that the two have the same age; (ii) the disc spectrum of HD 166191 is well matched by a standard radiative transfer model of a gaseous protoplanetary disc with an inner hole and (iii) the HD 166191 mid-IR silicate feature is more consistent with similarly primordial objects. We note some potential issues with the debris disc interpretation that should be considered for such extreme objects, whose lifetime at the current brightness is much shorter than the stellar age, or in the case of the outer component requires a mass comparable to the solid component of the solar nebula. These aspects individually and collectively argue that HD 166191 is a 4-5 Myr old star that hosts a gaseous transition disc. Though it does not argue in favour of either scenario, we find strong evidence for 3-5 μm disc variability. We place HD 166191 in context with discs at different evolutionary stages, showing that it is a potentially important object for understanding the protoplanetary to debris disc transition.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 01 Feb 2022 01:28
Last Modified: 02 Feb 2022 04:19
Uncontrolled Keywords: Circumstellar matter; Planets and satellites: formation; Protoplanetary discs; Stars: individual: HD 163296; Stars: individual: HD 166191
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/stt2435
URI: http://eprints.usq.edu.au/id/eprint/45001

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