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Title: V899 MON: AN OUTBURSTING PROTOSTAR WITH A PECULIAR LIGHT CURVE, AND ITS TRANSITION PHASES

Abstract

We present a detailed study of V899 Mon (a new member in the FUors/EXors family of young low-mass stars undergoing outburst), based on our long-term monitoring of the source starting from 2009 November to 2015 April. Our optical and near-infrared photometric and spectroscopic monitoring recorded the source transitioning from its first outburst to a short-duration quiescence phase (<1 yr), and then returning to a second outburst. We report here the evolution of the outflows from the inner region of the disk as the accretion rate evolved in various epochs. Our high-resolution (R ∼ 37,000) optical spectrum could resolve interesting clumpy structures in the outflow traced by various lines. Change in far-infrared flux was also detected between two outburst epochs. Based on our observations, we constrained various stellar and envelope parameters of V899 Mon, as well as the kinematics of its accretion and outflow. The photometric and spectroscopic properties of this source fall between classical FUors and EXors. Our investigation of V899 Mon hints at instability associated with magnetospheric accretion being the physical cause of the sudden short-duration pause of the outburst in 2011. It is also a good candidate to explain similar short-duration pauses in outbursts of some other FUors/EXorsmore » sources.« less

Authors:
; ;  [1]; ;  [2];  [3];  [4];  [5];  [6]
  1. Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005 (India)
  2. Indian Institute of Astrophysics, Korama ngala, Bangalore 560 034 (India)
  3. Inter-University Centre for Astronomy and Astrophysics, Pune 411 007 (India)
  4. National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411 007 (India)
  5. Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/SAp, CEA Saclay, Orme des Merisiers, F-91191 Gif-sur-Yvette (France)
  6. National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan)
Publication Date:
OSTI Identifier:
22521811
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 815; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DIAGRAMS; FAR INFRARED RADIATION; INSTABILITY; MASS; MONITORING; NEAR INFRARED RADIATION; PHASE TRANSFORMATIONS; PROTOPLANETS; PROTOSTARS; RESOLUTION; STARS; STELLAR MAGNETOSPHERES; VISIBLE RADIATION; VISIBLE SPECTRA

Citation Formats

Ninan, J. P., Ojha, D. K., Baug, T., Bhatt, B. C., Anupama, G. C., Mohan, V., Ghosh, S. K., Men’shchikov, A., Tamura, M., and Henning, Th., E-mail: ninan@tifr.res.in. V899 MON: AN OUTBURSTING PROTOSTAR WITH A PECULIAR LIGHT CURVE, AND ITS TRANSITION PHASES. United States: N. p., 2015. Web. doi:10.1088/0004-637X/815/1/4.
Ninan, J. P., Ojha, D. K., Baug, T., Bhatt, B. C., Anupama, G. C., Mohan, V., Ghosh, S. K., Men’shchikov, A., Tamura, M., & Henning, Th., E-mail: ninan@tifr.res.in. V899 MON: AN OUTBURSTING PROTOSTAR WITH A PECULIAR LIGHT CURVE, AND ITS TRANSITION PHASES. United States. https://doi.org/10.1088/0004-637X/815/1/4
Ninan, J. P., Ojha, D. K., Baug, T., Bhatt, B. C., Anupama, G. C., Mohan, V., Ghosh, S. K., Men’shchikov, A., Tamura, M., and Henning, Th., E-mail: ninan@tifr.res.in. 2015. "V899 MON: AN OUTBURSTING PROTOSTAR WITH A PECULIAR LIGHT CURVE, AND ITS TRANSITION PHASES". United States. https://doi.org/10.1088/0004-637X/815/1/4.
@article{osti_22521811,
title = {V899 MON: AN OUTBURSTING PROTOSTAR WITH A PECULIAR LIGHT CURVE, AND ITS TRANSITION PHASES},
author = {Ninan, J. P. and Ojha, D. K. and Baug, T. and Bhatt, B. C. and Anupama, G. C. and Mohan, V. and Ghosh, S. K. and Men’shchikov, A. and Tamura, M. and Henning, Th., E-mail: ninan@tifr.res.in},
abstractNote = {We present a detailed study of V899 Mon (a new member in the FUors/EXors family of young low-mass stars undergoing outburst), based on our long-term monitoring of the source starting from 2009 November to 2015 April. Our optical and near-infrared photometric and spectroscopic monitoring recorded the source transitioning from its first outburst to a short-duration quiescence phase (<1 yr), and then returning to a second outburst. We report here the evolution of the outflows from the inner region of the disk as the accretion rate evolved in various epochs. Our high-resolution (R ∼ 37,000) optical spectrum could resolve interesting clumpy structures in the outflow traced by various lines. Change in far-infrared flux was also detected between two outburst epochs. Based on our observations, we constrained various stellar and envelope parameters of V899 Mon, as well as the kinematics of its accretion and outflow. The photometric and spectroscopic properties of this source fall between classical FUors and EXors. Our investigation of V899 Mon hints at instability associated with magnetospheric accretion being the physical cause of the sudden short-duration pause of the outburst in 2011. It is also a good candidate to explain similar short-duration pauses in outbursts of some other FUors/EXors sources.},
doi = {10.1088/0004-637X/815/1/4},
url = {https://www.osti.gov/biblio/22521811}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 815,
place = {United States},
year = {Thu Dec 10 00:00:00 EST 2015},
month = {Thu Dec 10 00:00:00 EST 2015}
}