TY - JOUR
T1 - V899 Mon
T2 - a peculiar eruptive young star close to the end of its outburst
AU - Park, Sunkyung
AU - Kóspál, Ágnes
AU - Cruz-Sáenz de Miera, Fernando
AU - Siwak, Michal
AU - Dróżdż, Marek
AU - Ignácz, Bernadett
AU - Jaffe, Daniel T.
AU - Könyves-Tóth, Réka
AU - Lee, Jae-Joon
AU - Lee, Jeong-Eun
AU - Mace, Gregory N.
AU - Ogłoza, Waldemar
AU - Pál, András
AU - Potter, Stephen B.
AU - Szabo, Zsofia Marianna
AU - Stefako, Ramotholo
AU - Worters, Hannah L.
N1 - Funding: This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program under grant agreement No. 716155 (SACCRED) and the “Transient Astrophysical Objects” GINOP 2.3.2-15-2016- 00033 project of the National Research, Development and Innovation Office (NKFIH), Hungary, funded by the European Union. Zs.M.Sz is supported by the ÚNKP-20-2 New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development and Innovation Fund.
PY - 2021/12/20
Y1 - 2021/12/20
N2 - The eruptive young star V899 Mon shows characteristics of both FUors and EXors. It reached a peak brightness in 2010, then briefly faded in 2011, followed by a second outburst. We conducted multifilter optical photometric monitoring, as well as optical and near-infrared spectroscopic observations, of V899 Mon. The light curves and color–magnitude diagrams show that V899 Mon has been gradually fading after its second outburst peak in 2018, but smaller accretion bursts are still happening. Our spectroscopic observations taken with Gemini/IGRINS and VLT/MUSE show a number of emission lines, unlike during the outbursting stage. We used the emission line fluxes to estimate the accretion rate and found that it has significantly decreased compared to the outbursting stage. The mass-loss rate is also weakening. Our 2D spectroastrometric analysis of emission lines recovered jet and disk emission of V899 Mon. We found that the emission from permitted metallic lines and the CO bandheads can be modeled well with a disk in Keplerian rotation, which also gives a tight constraint for the dynamical stellar mass of 2 M⊙. After a discussion of the physical changes that led to the changes in the observed properties of V899 Mon, we suggest that this object is finishing its second outburst.
AB - The eruptive young star V899 Mon shows characteristics of both FUors and EXors. It reached a peak brightness in 2010, then briefly faded in 2011, followed by a second outburst. We conducted multifilter optical photometric monitoring, as well as optical and near-infrared spectroscopic observations, of V899 Mon. The light curves and color–magnitude diagrams show that V899 Mon has been gradually fading after its second outburst peak in 2018, but smaller accretion bursts are still happening. Our spectroscopic observations taken with Gemini/IGRINS and VLT/MUSE show a number of emission lines, unlike during the outbursting stage. We used the emission line fluxes to estimate the accretion rate and found that it has significantly decreased compared to the outbursting stage. The mass-loss rate is also weakening. Our 2D spectroastrometric analysis of emission lines recovered jet and disk emission of V899 Mon. We found that the emission from permitted metallic lines and the CO bandheads can be modeled well with a disk in Keplerian rotation, which also gives a tight constraint for the dynamical stellar mass of 2 M⊙. After a discussion of the physical changes that led to the changes in the observed properties of V899 Mon, we suggest that this object is finishing its second outburst.
U2 - 10.3847/1538-4357/ac29c4
DO - 10.3847/1538-4357/ac29c4
M3 - Article
SN - 0004-637X
VL - 923
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 171
ER -