J/ApJ/953/86 The optical to IR lightcurve of V960 Mon (Carvalho+, 2023)
Modeling the multiwavelength evolution of the V960 Mon system.
Carvalho A.S., Hillenbrand L.A., Hambsch F.-J., Dvorak S., Sitko M.,
Russell R.W., Hammond V., Connelley M., Ashley M.C.B., Hankins M.J.
<Astrophys. J., 953, 86 (2023)>
=2023ApJ...953...86C 2023ApJ...953...86C
ADC_Keywords: Stars, variable; YSOs; Photometry, UBVRI; Infrared;
Spectra, optical
Keywords: FU Orionis stars ; Young stellar objects ; Infrared sources ;
Stellar accretion disks ; Optical bursts
Abstract:
We study the evolution of the FU Ori object V960 Mon since its
outburst, using available multiwavelength photometric time series over
8yr, complemented by several epochs of moderate-dispersion
spectrophotometry. We find that the source fading can be
well-described by a decrease in the temperature of the inner disk,
which results from a combination of decreasing accretion rate and
increasing inner disk radius. We model the system with a disk
atmosphere model that produces the observed variations in multiband
photometry (this paper) and high-resolution spectral lines (a
companion paper; 2023ApJ...958..140C 2023ApJ...958..140C).
Description:
We use numerous archival sources and lightcurves assembled in previous
literature of the target, V960 Mon, to study its post-outburst
evolution across multiple bands spanning U in the near-ultraviolet to
WISE/W2 in the mid-infrared.
The first 6 months post-outburst are well-sampled by the photometry
assembled by and reported in Hackstein+ (2015, J/A+A/582/L12). We use
their data from Universitatssternwarte Bochum (USB) and The Remote
Observatory Atacama Desert (ROAD). The data from USB were taken with
RoBoTT (U, B, V, r, i, z) are labeled as ROBOTT in our plots.
We additionally use B, V, R, and I-band lightcurves accessible in the
American Association of Variable Star Observers (AAVSO) archive.
We also include photometry from the Gaia mission, which we accessed
via the Gaia ESA Archive.
We assemble the infrared lightcurves from several sources. Monitoring
of the target in J, H, K bands was also done by
Hackstein (2015, J/A+A/582/L12) using the 0.8m Infrared Imaging System
(IRIS).
The Gattini infrared survey (2016SPIE.9906E..2CM) provides J-band
photometry of V960 Mon starting in September 2018.
The object was also observed pre-outburst by the Wide-field Infrared
Survey Explorer (WISE) survey and post-outburst by the reactivation of
the WISE mission as NEOWISE.
See Section 2.1.2.
We use a high-dispersion visible range spectrum taken at the time of
the object's outburst at the Keck Observatory using the HIgh
Resolution Echelle Spectrograph (HIRES). The spectrum covers
4780-9220Å at a signal-to-noise of 170 at 7100Å.
See Section 2.2.1.
Our analysis also makes use of data from the NASA InfraRed Telescope
Facility (IRTF) SpeX spectrograph. We include the outburst epoch SpeX
spectrum of V960 Mon obtained on 2014 December 19 and published by
Connelley & Reipurth (2018ApJ...861..145C 2018ApJ...861..145C), who provide a detailed
description of the data reduction. We also make use of SpeX data taken
at several other epochs: 2015-Jan-15, 2016-Jan-06, and 2016-Jan-24,
all of which are previously unpublished. The SpeX observations were
obtained using the cross-dispersed echelle gratings between 0.8 and
5.4um.
See Section 2.2.2.
Objects:
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RA (ICRS) DE Designation(s)
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06 59 31.58 -04 05 27.7 V960 Mon = Gaia DR3 3101809648711790080
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 35 4771 *Photometry from AAVSO, Gaia, Gattini, and WISE,
shown in Figure 1
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Note on tablea1.dat: We present in Table A1 the photometry used in Figure 1,
and throughout this work, that is not already published. All of the
photometry from RoBoTT, ROAD, and IRIS can be found in
Hackstein+ 2015, J/A+A/582/L12
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
II/328 : AllWISE Data Release (Cutri+ 2013)
II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/A+A/582/L12 : V960 Mon light curves (Hackstein+, 2015)
J/ApJS/256/30 : ALMA 1.33mm images of 10 FU Orionis-type stars (Kospal+, 2021)
J/A+A/649/A3 : Gaia Early Data Release 3 photometric passbands (Riello+, 2021)
J/ApJ/917/80 : Opt-to-IR monitoring obs. of V1057 Cyg (Szabo+, 2021)
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 d JD [5287.5/9679.2] Date of observation,
JD-2450000.5
10- 16 F7.3 mag omag [5/17.51] Observed magnitude in Filter
18- 24 F7.3 mag e_omag [0/1] Uncertainty in omag
26- 32 A7 --- Tel Source/Telescope used for observation (1)
34- 35 A2 --- Filt Passband/Filter of observation
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Note (1): Source/Telescope as follows:
AAVSO = the American Association of Variable Star Observers (AAVSO)
archive for B, V, R, and I-band (4396 occurrences)
Gattini = The Gattini infrared survey in J-band (254 occurrences)
Gaia = Gaia BP, RP, and G-band photometry from the Gaia ESA Archive
(87 occurrences)
WISE = the Wide-field Infrared Survey Explorer survey (34 occurrences)
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History:
From electronic version of the journal
References:
Carvalho et al. Sp. line evol. 2023ApJ...958..140C 2023ApJ...958..140C
Licences: cc-by
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 24-Sep-2025