2018ApJ...852...56G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST07:20:04

2018ApJ...852...56G - Astrophys. J., 852, 56-56 (2018/January-1)

Star-disk interactions in multiband photometric monitoring of the classical T Tauri star GI Tau.

GUO Z., HERCZEG G.J., JOSE J., FU J., CHIANG P.-S., GRANKIN K., MICHEL R., YADAV R.K., LIU J., CHEN W.-P., LI G., XUE H., NIU H., SUBRAMANIAM A., SHARMA S., PRASERT N., FLORES-FAJARDO N., CASTRO A. and ALTAMIRANO L.

Abstract (from CDS):

The variability of young stellar objects is mostly driven by star-disk interactions. In long-term photometric monitoring of the accreting T Tauri star GI Tau, we detect extinction events with typical depths of ΔV∼2.5 mag that last for days to months and often appear to occur stochastically. In 2014-2015, extinctions that repeated with a quasi-period of 21 days over several months are the first empirical evidence of slow warps predicted by magnetohydrodynamic simulations to form at a few stellar radii away from the central star. The reddening is consistent with RV=3.85±0.5 and, along with an absence of diffuse interstellar bands, indicates that some dust processing has occurred in the disk. The 2015-2016 multiband light curve includes variations in spot coverage, extinction, and accretion, each of which results in different traces in color-magnitude diagrams. This light curve is initially dominated by a month-long extinction event and a return to the unocculted brightness. The subsequent light curve then features spot modulation with a 7.03 day period, punctuated by brief, randomly spaced extinction events. The accretion rate measured from U-band photometry ranges from 1.3×10–8 to 1.1×10–10M yr–1 (excluding the highest and lowest 5% of high- and low- accretion rate outliers), with an average of 4.7 ×10–9M yr–1. A total of 50% of the mass is accreted during bursts of 12.8×10–9M yr–1, which indicates limitations on analyses of disk evolution using single-epoch accretion rates.

Abstract Copyright: © 2018. The American Astronomical Society.

Journal keyword(s): stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be - stars: variables: T Tauri, Herbig Ae/Be

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 EM* LkCa 4 Or* 04 16 28.1070192558 +28 07 35.732032828   13.96   11.825   K7:Ve 142 0
2 V* V409 Tau Or* 04 18 10.7828823429 +25 19 57.378794100   15.00 13.34 12.88   K8 39 0
3 Barnard 18 Cld 04 31.2 +24 21           ~ 44 0
4 V* GI Tau Or* 04 33 34.0608378045 +24 21 17.067391746 14.34   13.70 12.15 11.06 K5Ve 250 1
5 V* GK Tau Or* 04 33 34.5626781676 +24 21 05.854541262 15.50   13.00 12.02 10.62 K7:Ve 271 0
6 V* AA Tau Or* 04 34 55.4222683130 +24 28 53.038273587 13.14 13.34 12.20     K5Ve 625 0
7 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3478 0
8 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 983 0
9 V* RW Aur TT* 05 07 49.5662483 +30 24 05.177426   10.86 9.60 9.95   K1/5e+K5e 708 0
10 V* DM Ori Or* 05 43 39.0071344530 -05 04 02.862461109   12.50 11.54 13.50   G 17 2
11 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1587 1
12 V* V582 Mon Or* 06 41 10.3403654169 +09 28 33.490089193   17.404   17.21 16.45 K5 165 0
13 2MASS J16042165-2130284 pr* 16 04 21.6546714640 -21 30 28.549578725   13.3       K2 91 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-07:20:04

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