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Gaia 17bpi: An FU Ori–type Outburst

Hillenbrand, Lynne A., Peña, Carlos Contreras, Morrell, Sam, Naylor, Tim, Kuhn, Michael A., Cutri, Roc M., Rebull, Luisa M., Hodgkin, Simon, Froebrich, Dirk, Mainzer, Amy K. and others. (2018) Gaia 17bpi: An FU Ori–type Outburst. The Astrophysical Journal, 869 (2). p. 146. ISSN 1538-4357. (doi:10.3847/1538-4357/aaf414)

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Abstract

We report on the source Gaia 17bpi and identify it as a new, ongoing FU Ori–type outburst, associated with a young stellar object. The optical light curve from Gaia exhibited a 3.5 mag rise with the source appearing to plateau in mid-/late 2018. Mid-infrared observations from NEOWISE also show a >3 mag rise that occurred in two stages, with the second one coincident with the optical brightening, and the first one preceding the optical brightening by ~1.5 yr. We model the outburst as having started between October and December of 2014. This wavelength-dependent aspect of young star accretion-driven outbursts has never been documented before. Both the mid-infrared and the optical colors of the object become bluer as the outburst proceeds. Optical spectroscopic characteristics in the outburst phase include: a GK-type absorption spectrum, strong wind/outflow in, e.g., Mgb, NaD, H?, K i, O i, and Ca ii profiles, and detection of Li i 6707 Å. The infrared spectrum in the outburst phase is similar to that of an M-type spectrum, notably exhibiting prominent H2O and 12CO (2–0) bandhead absorption in the K band, and likely He i wind in the Y band. The new FU Ori source Gaia 17bpi is associated with a little-studied dark cloud in the galactic plane, located at a distance of 1.27 kpc.

Item Type: Article
DOI/Identification number: 10.3847/1538-4357/aaf414
Uncontrolled keywords: circumstellar matter, stars: activity, stars: general, stars: pre-main sequence, stars: variables: general, stars: winds, outflows
Subjects: Q Science > QB Astronomy
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Dirk Froebrich
Date Deposited: 09 Jan 2019 12:48 UTC
Last Modified: 12 Jul 2019 10:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/71576 (The current URI for this page, for reference purposes)
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