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. =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 L_bol_=7.22L_{sun}_. The color-color and color-magnitude diagrams indicate that the evolution in the light curve is mostly gray. Multiple epochs of the H{alpha} 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^-7^M_{sun}_/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 7994{AA} 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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 43 276 Optical photometry of Gaia20eae -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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") -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Jan-2024