J/ApJ/923/171 V899 Mon opt-NIR spectra and light curves (Park+, 2021)
V899 Mon: a peculiar eruptive young star close to the end of its outburst.
Park S., Kospal A., Cruz-Saenz de Miera F., Siwak M., Drozdz M.,
Ignacz B., Jaffe D.T., Konyves-Toth R., Kriskovics L., Lee J.-J.,
Lee J.-E., Mace G.N., Ogloza W., Pal A., Potter S.B., Szabo Z.M.,
Sefako R., Worters H.L.
<Astrophys. J., 923, 171 (2021)>
=2021ApJ...923..171P 2021ApJ...923..171P
ADC_Keywords: YSOs; Photometry, ugriz; Spectra, infrared
Keywords: Young stellar objects ; FU Orionis stars ; Circumstellar disks ;
Multi-color photometry ; Photometry ; Spectroscopy ; Light curves
Abstract:
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 2M☉. 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.
Description:
We obtained ground-based optical photometric observations of V899 Mon
between 2017 November and 2021 May with different telescopes around
the world. At the Piszkesteto Mountain Station of Konkoly Observatory
(Hungary), we used two telescopes: a 60/90/180cm Schmidt telescope and
an 80cm Ritchey-Chretien (RC80) telescope. At the Mount Suhora
Observatory (MSO) of the Cracow Pedagogical University (Poland), we
used the 60cm Carl Zeiss telescope. At the South African Astronomical
Observatory (SAAO), we used Lesedi, the new SAAO 1m telescope. At
Adiyaman University Observatory (Turkey), we used ADYU60, a PlaneWave
60cm f/6.5 corrected Dall-Kirkham Astrograph telescope. During
2020-December and 2021-January, we also observed V899 Mon by means of
OMEGACAM installed on VST, as a part of our ESO program ID 106.21LL
(PI: Siwak).
In addition to our data, we utilize the public-domain ASAS-SN V and g
(Shappee+ 2014, J/ApJ/788/48 ; Kochanek+ 2017PASP..129j4502K 2017PASP..129j4502K) and ZTF
g'r' (Masci+ 2019PASP..131a8003M 2019PASP..131a8003M) light curves extracted and
calibrated to standard photometric systems by means of dedicated
pipelines.
Finally, we extracted the light curve from the calibrated full-field
images obtained with a 10 minute (0.00694436day) cadence by TESS
during 2020 December 18-2021 January 13 (Sector 33).
Optical integral field spectroscopic observations were conducted for
V899 Mon using the Multi Unit Spectroscopic Explorer (MUSE) on the
Very Large Telescope (VLT) at Paranal Observatory (Chile). The data
were taken on 2021 January 22 as part of our ESO program ID 106.21KL
(PI: Cruz-Saenz de Miera); wavelength coverage between 4800 and
9300Å with a resolving power between 1770 and 3590.
See Section 2.3.
The NIR spectrum of V899 Mon was obtained with the Immersion GRating
INfrared Spectrograph (IGRINS) installed on the 8.1m Gemini South
telescope on 2020 November 6. IGRINS provides high-resolution
(R∼45000) NIR spectra covering the full H (1.49-1.80um) and K
(1.96-2.46um) bands with a single exposure. See Section 2.4.
Objects:
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RA (ICRS) DE Designation(s)
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06 09 19.24 -06 41 55.8 V899 Mon = 2MASS J06091923-064155
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 144 56 Photometry of V899 Mon
sp.dat 44 3 Optical and NIR spectra of V899 Mon with
rich emission lines
sp/* . 3 Individual spectrum in ASCII format
(Data behind Figure 8)
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/339 : Swift/UVOT Serendipitous Source Catalog (Yershov, 2015)
J/A+A/507/881 : Emission lines in EX Lup optical spectrum (Sipos+, 2009)
J/AJ/140/1214 : Near-IR spectroscopic survey of class I YSOs (Connelley+, 2010)
J/A+A/511/A24 : MHO Catalogue (Davis+, 2010)
J/ApJ/778/116 : V1647 Ori long-term optical & NIR observations (Ninan+, 2013)
J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/ApJ/815/4 : V899 Mon long-term monitoring (Ninan+, 2015)
J/ApJ/831/133 : Follow-up of probable young star ASASSN-15qi (Herczeg+, 2016)
J/A+A/600/A20 : Lupus YSOs X-shooter spectroscopy (Alcala+, 2017)
J/ApJS/238/29 : IGRINS spectral library (Park+, 2018)
J/ApJ/889/148 : V346 Nor IJHKs photometry & IR spectra (Kospal+, 2020)
J/A+A/641/A33 : EX Lup SPHERE and SINFONI images (Rigliaco+, 2020)
J/ApJS/256/30 : ALMA 1.33mm images of 10 FU Orionis-type stars (Kospal+, 2021)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d HJD Heliocentric Julian Date
13- 18 F6.3 mag Umag [17.34/18.7]? U-band magnitude
20- 24 F5.3 mag e_Umag [0.02/0.8]? Uncertainty on the Umag
26- 31 F6.3 mag Bmag [14/16.63]? Johnson B magnitude
33- 37 F5.3 mag e_Bmag [0.004/0.16]? Uncertainty on the Bmag
39- 44 F6.3 mag g'mag [15.46/15.85]? g'-band magnitude
46- 50 F5.3 mag e_g'mag [0.004/0.05]? Uncertainty on the g'mag
52- 57 F6.3 mag Vmag [12.73/15.13]? Johnson V magnitude
59- 63 F5.3 mag e_Vmag [0.002/0.06]? Uncertainty on the Vmag
65- 70 F6.3 mag r'mag [14.16/14.46]? r'-band magnitude
72- 76 F5.3 mag e_r'mag [0.003/0.05]? Uncertainty on the r'mag
78- 83 F6.3 mag Rcmag [11.88/14.2]? Cousins R magnitude
85- 89 F5.3 mag e_Rcmag [0.006/0.03]? Uncertainty on the Rcmag
91- 96 F6.3 mag i'mag [13.46/13.74]? i'-band magnitude
98- 102 F5.3 mag e_i'mag [0.002/0.05]? Uncertainty on the i'mag
104- 109 F6.3 mag Icmag [10.94/13.21]? Cousins I magnitude
111- 115 F5.3 mag e_Icmag [0.004/0.05]? Uncertainty on the Icmag
117- 122 F6.3 mag z'mag [13/13.3]? z'-band magnitude
124- 128 F5.3 mag e_z'mag [0.014/0.02]? Uncertainty on the z'mag
130- 144 A15 --- Tel Telescope
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Byte-by-byte Description of file: sp.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Tel Telescope/Instrument
17- 19 A3 --- Band Spectrum band
21- 31 A11 "Y/M/D" Date Observation date
33- 44 A12 --- File Name of the file in subdirectory "sp"
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 10 F10.5 um lambda [1.47/9349.1] Wavelength
12- 24 E13.7 cW/m2/nm Flux [1e-15/4.91e-14]? Flux, erg/s/cm2/Å
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-May-2023