J/ApJ/927/125 Follow-up monitoring of Gaia20eae (Cruz-Saenz de Miera+, 2022)
Recurrent strong outbursts of an EXor-like young eruptive star Gaia20eae.
Cruz-Saenz de Miera F., Kospal A., Abraham P., Park S., Nagy Z., Siwak M.,
Kun M., Fiorellino E., Szabo Z.M., Antoniucci S., Giannini T., Nisini B.,
Szabados L., Kriskovics L., Ordasi A., Szakats R., Vida K., Vinko J.,
Zielinski P., Wyrzykowski L., Garcia-Alvarez D., Drozdz M., Ogloza W.,
Sonbas E.
<Astrophys. J., 927, 125 (2022)>
=2022ApJ...927..125C 2022ApJ...927..125C
ADC_Keywords: YSOs; Photometry, UBVRI
Keywords: Young stellar objects ; T Tauri stars ; Spectroscopy ;
Broad band photometry
Abstract:
We present follow-up photometric and spectroscopic observations, and
subsequent analysis of Gaia20eae. This source triggered photometric
alerts during 2020 after showing a ∼3mag increase in its brightness.
Its Gaia Alert light curve showed the shape of a typical eruptive
young star. We carried out observations to confirm Gaia20eae as an
eruptive young star and classify it. Its pre-outburst spectral energy
distribution shows that Gaia20eae is a moderately embedded Class II
object with Lbol=7.22L☉. The color-color and color-magnitude
diagrams indicate that the evolution in the light curve is mostly
gray. Multiple epochs of the Hα line profile suggest an
evolution of the accretion rate and winds. The near-infrared spectra
display several emission lines, a feature typical of EX Lupi-type
(EXor) eruptive young stars. We estimated the mass accretion rate
during the dimming phase to be dM/dt=3-8x10-7M☉/yr, higher
than typical T Tauri stars of similar mass and comparable to other
EXors. We conclude Gaia20eae is a new EXor-type candidate.
Description:
We started the photometric monitoring of Gaia20eae at the beginning of
2020 September. At the Piszkesteto Mountain Station of Konkoly
Observatory (Hungary), we used the 80cm Ritchey-Chretien (RC80)
telescope equipped with the Johnson BV and Sloan filters. At the Mount
Suhora Observatory (MSO) of the Cracow Pedagogical University
(Poland), we used the 60cm Carl-Zeiss telescope with the Johnson BVRI
and Sloan filters. At Adiyaman University Observatory (Turkey), we
used ADYU60, a PlaneWave 60cm f/6.5 corrected Dall-Kirkham Astrograph
telescope with the Johnson BVRI and Sloan filters.
See Section 3.1.
We obtained optical spectra of Gaia20eae in two observatories: the
first was obtained during the brightness peak, on 2020 September 8/9
using the 2m Liverpool Telescope equipped with the Spectrograph for
the Rapid Acquisition of Transients (SPRAT; ID: XOL20B01,
PI: P. Zielinski). SPRAT is providing low-resolution (R=350) spectra
in the 4020 to 7994Å range.
The second spectrum was obtained during the brightness decline stage,
on 2021 April 9/10 using the Gran Telescopio Canarias (GTC) equipped
with the Multi-Espectrografo en GTC de Alta Resolucion para Astronomia
(MEGARA; ID: GTCMULTIPLE2D-21A, PI: D. Garcia).
We obtained a new optical spectrum of Gaia20eae with the
high-resolution Fibre-fed Echelle Spectrograph (FIES) instrument on
the Nordic Optical Telescope (NOT) on 2021 May 10 and on 2021 May 31.
See Section 3.2.
We obtained a near-infrared intermediate resolution (R=2500) JHKs
spectrum of Gaia20eae on 2021 March 17, with the 0.6" slit of the
NOTCAM instrument on the NOT (ID: 61-423, PI: F. Cruz-Saenz de Miera).
The second set of medium-resolution (R=4000-5000) spectra in the JHKs
bands was obtained on 2021 May 1 by means of the GTC equipped with the
EMIR configured in the long-slit mode (PI: D. Garcia).
See Section 3.4.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
19 25 40.60 +15 07 46.5 Gaia 20eae = AT 2020nrs
----------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 43 276 Optical photometry of Gaia20eae
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See also:
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/AJ/136/2413 : Galactic midplane Spitzer red sources (Robitaille+, 2008)
J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)
J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)
J/AJ/144/192 : Spitzer survey of Orion A and B. I. YSOs (Megeath+, 2012)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/ApJS/220/11 : SEDs of Spitzer YSOs in the Gould Belt (Dunham+, 2015)
J/ApJ/806/231 : MISFITS survey: HCO+ obs. of Spitzer YSOs (Heiderman+, 2015)
J/ApJ/815/4 : V899 Mon long-term monitoring (Ninan+, 2015)
J/A+A/600/A20 : Lupus YSOs X-shooter spectroscopy (Alcala+, 2017)
J/ApJ/839/113 : Molecular clouds with GLIMPSE/MIPSGAL (Retes-Romero+, 2017)
J/A+A/627/A135 : VRI photometry of IC5070 variable stars (Bhardwaj+, 2019)
J/ApJ/889/148 : V346 Nor IJHKs photometry & IR spectra (Kospal+, 2020)
J/A+A/650/A43 : Spectra of NGC 1333 Class I-Class II stars (Fiorellino+, 2021)
J/A+A/652/A76 : Gaia Photometric Science Alerts (Hodgkin+, 2021)
J/ApJS/254/33 : Gal. midplane Spitzer/IRAC cand. YSOs (SPICY) (Kuhn+, 2021)
J/ApJ/923/171 : V899 Mon opt-NIR spectra and light curves (Park+, 2021)
J/ApJ/920/132 : NEOWISE 6.5yr variability in YSOs (Park+, 2021)
J/ApJ/917/80 : Opt-to-IR monitoring obs. of V1057 Cyg (Szabo+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d JD Julian date of observation
18- 19 A2 --- Filt Broadband filter (gri or BVRcIc)
21- 27 F7.4 mag omag [13.48/22.5] Observed magnitude in Filt
29- 34 F6.4 mag e_omag [0.0036/0.2] Uncertainty in omag
36- 43 A8 --- Tel Telescope used ("RC80", "Adiyaman" or "Suhora")
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Jan-2024