2003ApJ...592..282J


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.29CET00:04:47

2003ApJ...592..282J - Astrophys. J., 592, 282-287 (2003/July-3)

Evidence for a T Tauri phase in young brown dwarfs.

JAYAWARDHANA R., MOHANTY S. and BASRI G.

Abstract (from CDS):

As part of a multifaceted program to investigate the origin and early evolution of substellar objects, we present high-resolution Keck optical spectra of 14 very low mass sources in the IC 348 young cluster and the Taurus star-forming cloud. All of our targets, which span a range of spectral types from M5 to M8, exhibit moderate to very strong Hα emission. In half of the IC 348 objects, the Hα profiles are broad and asymmetric, indicative of ongoing accretion. Of these, IC 348-355 (M8) is the lowest mass object to date to show accretion-like Hα. Three of our ∼M6 IC 348 targets with broad Hα also harbor broad O I (8446 Å) and Ca II (8662 Å) emission, and one shows broad He I (6678 Å) emission; these features are usually seen in strongly accreting classical T Tauri stars. We find that in very low mass accretors, the Hα profile may be somewhat narrower than that in higher mass stars. We propose that low accretion rates combined with small infall velocities at very low masses can conspire to produce this effect. In the nonaccretors in our sample, Hα emission is commensurate with, or higher than, saturated levels in field M dwarfs of similar spectral type. Our results constitute the most compelling evidence to date that young brown dwarfs undergo a T Tauri-like accretion phase similar to that in stars. This is consistent with a common origin for most low-mass stars, brown dwarfs, and isolated planetary mass objects.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - Stars: Planetary Systems - Stars: Formation - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence - Techniques: Spectroscopic

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Cl* IC 348 LRL 256 Y*O 03 43 55.2707494900 +32 07 53.326817696   21.96 20.10     M5 27 0
2 Cl* IC 348 LRL 367 TT* 03 43 59.1614012676 +32 05 56.808196664       19.74 17.69 ~ 20 0
3 Cl* IC 348 LRL 363 TT* 03 44 17.2593998459 +32 00 15.306656328         18.32 ~ 23 0
4 Cl* IC 348 LRL 205 Y*O 03 44 29.8024787680 +32 00 54.600923029           M6 31 0
5 Cl* IC 348 LRL 415 Y*O 03 44 29.9648282902 +32 09 39.461962034           M6 30 0
6 Cl* IC 348 LRL 382 Y*O 03 44 30.9546043001 +32 02 44.133156088           M5 28 0
7 IC 348 OpC 03 44 34 +32 09.8           ~ 1238 1
8 Cl* IC 348 LRL 165 Y*O 03 44 35.4490971917 +32 08 56.399128679     20.73 17.71 16.028 M5.25 43 0
9 Cl* IC 348 LRL 353 TT* 03 44 38.1431593187 +32 10 21.571534574       17.71 16.920 ~ 24 0
10 Cl* IC 348 LRL 355 Y*O 03 44 39.2037379209 +32 08 13.750364912         18.034 M8 27 0
11 Cl* IC 348 LRL 286 TT* 03 45 06.7125051403 +32 09 30.732288640       18.76 16.59 ~ 18 0
12 [BCG93] 1 TT* 04 14 17.6094853639 +28 06 09.650035718 18.04         M4.5 75 0
13 2MASS J04181710+2828419 TT* 04 18 17.1091861192 +28 28 41.921033525     22.175     M6.4 75 0
14 V* DG Tau Or* 04 27 04.6913654419 +26 06 16.041555299 13.57 13.97 10.50 12.28   K6Ve 942 1
15 2MASS J04341527+2250309 Y*O 04 34 15.2773856137 +22 50 30.804533445     23.427     M7 41 0
16 2MASS J04361038+2259560 BD* 04 36 10.3838421343 +22 59 56.003013804     22.520   16.81 M8Ve 46 0
17 2MASS J04363893+2258119 BD* 04 36 38.9288541165 +22 58 11.845890661     21.654   16.88 M7.75 45 0
18 V* GM Tau Or* 04 38 21.3390129259 +26 09 13.784439336     17.577   15.04 M6.5 94 0
19 ITG 17 Y*O 04 39 47.4820305505 +26 01 40.693626234     21.556   15.78 M7 85 0
20 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3575 0
21 V* DR Tau Or* 04 47 06.2152696011 +16 58 42.814250257 12.03 11.86 10.50 12.19   K5Ve 478 0
22 UScoCTIO 75 LM* 16 00 30.2343779838 -23 34 45.617534170           M6e 34 0
23 NAME Upper Sco Association As* 16 12 -23.4           ~ 1065 1
24 [GY92] 5 Y*O 16 26 21.5389368381 -24 26 01.000528521       18.30 15.80 M7 61 1
25 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3086 0

    Equat.    Gal    SGal    Ecl

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2020.11.29-00:04:47

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