@article{dbe6f4f6aa344c029b13e5bce8e85690,
title = "Gaia 20eae: A Newly Discovered Episodically Accreting Young Star",
abstract = "The Gaia Alert System issued an alert on 2020 August 28, on Gaia 20eae when its light curve showed a ∼4.25 magnitude outburst. We present multiwavelength photometric and spectroscopic follow-up observations of this source since 2020 August and identify it as the newest member of the FUor/EXor family of sources. We find that the present brightening of Gaia 20eae is not due to the dust-clearing event but due to an intrinsic change in the spectral energy distribution. The light curve of Gaia 20eae shows a transition stage during which most of its brightness (∼3.4 mag) has occurred on a short timescale of 34 days with a rise rate of 3 mag/month. Gaia 20eae has now started to decay at a rate of 0.3 mag/month. We have detected a strong P Cygni profile in Hα, which indicates the presence of winds originating from regions close to the accretion. We find signatures of very strong and turbulent outflow and accretion in Gaia 20eae during this outburst phase. We have also detected a redshifted absorption component in all of the Ca ii IR triplet lines consistent with a signature of hot infalling gas in the magnetospheric accretion funnel. This enables us to constrain the viewing angle with respect to the accretion funnel. Our investigation of Gaia 20eae points toward magnetospheric accretion being the phenomenon for the current outburst.",
author = "Arpan Ghosh and Saurabh Sharma and Ninan, {Joe P.} and Ojha, {Devendra K.} and Bhatt, {Bhuwan C.} and Shubham Kanodia and Suvrath Mahadevan and Gudmundur Stefansson and Yadav, {R. K.} and Gour, {A. S.} and Rakesh Pandey and Tirthendu Sinha and Neelam Panwar and Wisniewski, {John P.} and Ca{\~n}as, {Caleb I.} and Lin, {Andrea S.J.} and Arpita Roy and Fred Hearty and Lawrence Ramsey and Paul Robertson and Christian Schwab",
note = "Funding Information: IRAF is distributed by National Optical Astronomy Observatories, USA, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with National Science Foundation for performing image processing. Funding Information: We thank the anonymous reviewer for valuable comments, which greatly improved the scientific content of the paper. We thank the staff at the 1.3 m DFOT and 3.6 m DOT, Devasthal (ARIES), for their cooperation during observations. It is a pleasure to thank the members of 3.6 m DOT team and IR astronomy group at TIFR for their support during TANSPEC observations. TIFR−ARIES Near Infrared Spectrometer (TANSPEC) was built in collaboration with TIFR, ARIES and MKIR, Hawaii for the DOT. We thank the staff of IAO, Hanle and CREST, Hosakote, that made these observations possible. The facilities at IAO and CREST are operated by the Indian Institute of Astrophysics. This work has made use of data from the European Space Agency (ESA) mission Gaia ( https://www.cosmos.esa.int/gaia ), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium ). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. These results are based on observations obtained with the Habitable-zone Planet Finder Spectrograph on the HET. We acknowledge support from NSF grants AST-1006676, AST-1126413, AST-1310885, AST-1310875, ATI 2009889, ATI-2009982, and AST-2108512 in the pursuit of precision radial velocities in the NIR. We acknowledge support from the Heising-Simons Foundation via grant 2017-0494. The Hobby–Eberly Telescope is a joint project of the University of Texas at Austin, the Pennsylvania State University, Ludwig-Maximilians-Universit{\"a}t M{\"u}nchen, and Georg-August Universit{\"a}t Gottingen. The HET is named in honor of its principal benefactors, William P. Hobby and Robert E. Eberly. The HET collaboration acknowledges the support and resources from the Texas Advanced Computing Center. We thank the Resident astronomers and Telescope Operators at the HET for the skillful execution of our observations with HPF. C.I.C. acknowledges support by NASA Headquarters under the NASA Earth and Space Science Fellowship Program through grant 80NSSC18K1114. S.S., N.P., and R.Y. acknowledge the support of the Department of Science and Technology, Government of India, under project No. DST/INT/Thai/P-15/2019. D.K.O. acknowledges the support of the Department of Atomic Energy, Government of India, under Project Identification No. RTI 4002. Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",
year = "2022",
month = feb,
day = "1",
doi = "10.3847/1538-4357/ac41c2",
language = "English (US)",
volume = "926",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",
}