2021ApJ...921...86F

Query : 2021ApJ...921...86F

2021ApJ...921...86F - Astrophys. J., 921, 86-86 (2021/November-1)

Detection of H2 in the TWA 7 system: a probable circumstellar origin.

FLAGG L., JOHNS-KRULL C.M., FRANCE K., HERCZEG G., NAJITA J., CARPENTER J.M. and KENYON S.J.

Abstract (from CDS):

Using HST-COS far-UV spectra, we have discovered warm molecular hydrogen in the TWA 7 system. TWA 7, a ∼9 Myr old M2.5 star, has a cold debris disk and has previously shown no signs of accretion. Molecular hydrogen is expected to be extremely rare in a debris disk. While molecular hydrogen can be produced in starspots or the lower chromospheres of cool stars such as TWA 7, fluxes from progressions that get pumped by the wings of Lyα indicate that this molecular hydrogen could be circumstellar and thus that TWA 7 is accreting at very low levels and may retain a reservoir of gas in the near circumstellar environment.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Protoplanetary disks - Debris disks - T Tauri stars - Planet formation - High resolution spectroscopy - Ultraviolet astronomy - Circumstellar gas

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 - 2024 		#notes
1 V* BP Tau Or* 04 19 15.8339827632 +29 06 26.926959492   13.13 12.12 11.89   K5/7Ve 664 0
2 V* DE Tau Or* 04 21 55.6347850824 +27 55 06.184016436 15.18 15.13 13.80     M3Ve 258 0
3 V* UX Tau Or* 04 30 03.99626 +18 13 49.4355 11.23 11.84 10.80 9.83 9.05 K2Ve+M1Ve 355 0
4 V* HN Tau Or* 04 33 39.3629421552 +17 51 52.289234280   14.76 13.40 13.05   K5e 255 0
5 V* DM Tau Or* 04 33 48.7336763736 +18 10 09.973460280 14.30 14.82 14.00     M2Ve 633 0
6 V* AA Tau Or* 04 34 55.4201902392 +24 28 53.033624580 13.14 13.34 12.20 12.03   K5Ve 723 0
7 EM* LkCa 15 Or* 04 39 17.7911622816 +22 21 03.390090984   13.01 12.03 11.61   K5:Ve 689 1
8 HD 285968 PM* 04 42 55.7750207949 +18 57 29.395947044 12.668 11.49 9.951 8.931 7.702 M2.5V 335 2
9 V* DR Tau Or* 04 47 06.2151561264 +16 58 42.813872580 12.03 11.86 10.50 12.19   K5Ve 534 0
10 V* GM Aur Or* 04 55 10.9815576936 +30 21 59.373771876 14.59 13.351 12.242 11.798   K3Ve 688 0
11 V* SU Aur Or* 04 55 59.3866872552 +30 34 01.499608092   10.33 9.30 9.17   G2IIIne 591 0
12 V* EP Cha Or* 08 47 01.6439909496 -78 59 34.380161016     11.1     K5IVe 92 0
13 V* CE Ant TT* 10 42 30.1018928760 -33 40 16.229805204   12.21 10.91   9.10 M2Ve 208 1
14 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 1892 1
15 NAME TW Hya Association As* 11 01.9 -34 42           ~ 942 0
16 HD 98800B SB* 11 22 05.2890267409 -24 46 38.767455498   11.18 9.92     ~ 131 1
17 Ross 905 PM* 11 42 11.0933350978 +26 42 23.650782778   12.06 10.613 10.272 8.24 M3V 645 1
18 BD-07 4003 BY* 15 19 26.8269387505 -07 43 20.189497466 13.403 11.76 10.560 9.461 8.911 M3V 641 2
19 V* MY Lup TT* 16 00 44.5202267160 -41 55 30.935126748   12.64 12.17 11.06   K0 111 0
20 Haro 1-6 Or* 16 26 03.0276684144 -24 23 36.188140848   14.15 14.01 12.38 10.80 K0 217 2
21 HD 156384C PM* 17 18 58.8272997802 -34 59 48.612673382 12.96 11.79 10.22 10.05 8.82 M1.5V 221 1
22 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1153 0
23 HD 204961 PM* 21 33 33.9751191976 -49 00 32.399427028 11.359 10.176 8.672 7.665 6.479 M2/3V 290 1
24 BD-15 6290 BY* 22 53 16.7325836486 -14 15 49.304052185 12.928 11.749 10.192 9.013 7.462 M3.5V 1013 1
25 NAME Local Bubble ISM ~ ~           ~ 898 0

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