2023A&A...673A..90S

Query : 2023A&A...673A..90S

2023A&A...673A..90S - Astronomy and Astrophysics, volume 673A90 (2023/5-1)

Hot subdwarfs in close binaries observed from space II. Analyses of the light variations.

SCHAFFENROTH V., BARLOW B.N., PELISOLI I., GEIER S. and KUPFER T.

Abstract (from CDS):

Context. Hot subdwarfs in close binaries with either M dwarf, brown dwarf, or white dwarf companions show unique light variations. In hot subdwarf binaries with M dwarf or brown dwarf companions, we can observe the so-called reflection effect, while in hot subdwarfs with close white dwarf companions, we find ellipsoidal modulation and/or Doppler beaming.
Aims. Analyses of these light variations can be used to derive the mass and radius of the companion and determine its nature. Thereby, we can assume the most probable sdB mass and the radius of the sdB derived by the fit of the spectral energy distribution and the Gaia parallax.
Methods. In the high signal-to-noise space-based light curves from the Transiting Exoplanet Survey Satellite and the K2 space mission, several reflection effect binaries and ellipsoidal modulation binaries have been observed with much better quality than with ground-based observations. The high quality of the light curves allowed us to analyze a large sample of sdB binaries with M dwarf or white dwarf companions using LCURVE.
Results. For the first time, we can constrain the absolute parameters of 19 companions of reflection effect systems, covering periods from 2.5 to 19 h and with companion masses from the hydrogen-burning limit to early M dwarfs. Moreover, we were able to determine the mass of eight white dwarf companion to hot subdwarf binaries showing ellipsoidal modulations, covering the as-yet unexplored period range of 7 to 19 h. The derived masses of the white dwarf companions show that all but two of the white dwarf companions are most likely helium-core white dwarfs. Combining our results with previously measured rotation velocities allowed us to derive the rotation period of seven sdBs in short-period binaries. In four of those systems, the rotation period of the sdB agrees with a tidally locked orbit, whereas in the other three systems, the sdB rotates significantly more slowly.

Abstract Copyright: © The Authors 2023

Journal keyword(s): binaries : close - stars: variables: general - subdwarfs - stars: horizontal-branch - stars: low-mass - stars: fundamental parameters

Simbad objects: 57

goto Full paper

goto View the references in ADS

Number of rows : 57
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Ton S 183 HS* 01 01 17.5722745104 -33 42 45.434983572   12.39 14.631 12.95   sdB 53 0
2 Feige 11 HS* 01 04 21.6747168600 +04 13 37.054495956 10.847 11.826 12.065 12.183 12.324 sdB2VIHe4 136 0
3 GD 687 HS* 01 10 18.6196714608 -34 00 25.710906636   13.89 14.08 14.39   sdBHe1 40 0
4 FBS 0117+396 HS* 01 20 22.9396883304 +39 50 59.434295604   15.15 15.34     sdB+dM 33 0
5 PG 0133+114 HS* 01 36 26.1919824456 +11 39 32.100292692   10.74       sdB1.5VIIHe4 48 0
6 CD-24 731 HS* 01 43 48.5449039272 -24 05 10.223541204   11.6 11.9     sdBHe0 71 0
7 GD 1068 HS* 02 00 13.2626006016 -17 28 43.779961488   11.78 12.07     sdB 19 0
8 EC 02200-2338 HS* 02 22 19.8375036240 -23 24 55.937378952   11.79 12.01     sdB 17 0
9 HE 0230-4323 HS* 02 32 54.6772339416 -43 10 27.791218308     13.78     sdB 35 0
10 PB 9286 HS* 02 50 23.9334771912 -04 06 13.942378620   12.45 13.11     sdB 17 0
11 Cl Melotte 20 488 HS* 03 21 39.6300972744 +47 27 18.797557932   11.54 11.73 11.83 11.55 sdB 25 0
12 Lan 30 HS* 03 28 55.2613544112 +50 35 29.669633016 13.644 14.3 14.3     sdB 19 0
13 BPS CS 22169-0001 HS* 03 56 23.3187391032 -15 09 19.438525044 11.50 12.61 12.88     sdB 25 0
14 KUV 04421+1416 HS* 04 44 56.8983457992 +14 21 50.176351836   15.28       sdB 46 0
15 CPD-64 481 HS* 05 47 59.3028778320 -64 23 03.123185352   10.97 11.17     sdB 44 0
16 KPD 0629-0016 HS* 06 31 53.8164813456 -00 19 13.080321372 14.12 14.98 14.94 15.18   sdB 34 1
17 HD 265435 HS* 06 53 24.3009681624 +33 03 34.242314004   11.84 11.78     sdOB 40 0
18 ATO J109.9191-21.8893 SB* 07 19 40.5821572368 -21 53 21.883015500   11.97 12.30     ~ 11 0
19 [MTR2015] OW J074106.07-294811.0 HS* 07 41 06.0719239488 -29 48 11.054564748           sdOBHe+D 15 0
20 GALEX J075147.0+092526 HS* 07 51 47.1421965408 +09 25 28.169267772   13.94 14.09 14.35   sdB 12 0
21 UCAC4 279-032880 HS* 08 15 30.7844652311 -34 21 23.452245602     16.813   16.845 sdB 5 0
22 GALEX J082340.0+081937 HS* 08 23 40.0396980072 +08 19 36.526547208   14.574 14.709 15.092   sdB+D 18 0
23 EVR-CB-001 WD* 08 48 15.5574681576 -74 18 54.669380364   12.517 12.619 12.852   D 14 0
24 EVR-CB-004 HS* 08 53 12.5591496072 -28 46 06.178282716   12.983 13.074 13.340   sdO? 12 0
25 GALEX J093448.2-251248 HS* 09 34 48.2334481632 -25 12 44.460674928   12.72 13.09     sdO 13 0
26 PG 0934+186 HS* 09 37 16.2701312016 +18 25 11.246800692   12.85 13.13 13.44   sdB 30 0
27 PG 1000+408 HS* 10 03 54.2702671056 +40 34 18.121531548 11.919 12.988 13.318 13.465 13.631 sdO 38 0
28 PG 1043+760 HS* 10 47 04.9690510104 +75 44 22.968415320   12.97       sdB 32 0
29 PG 1136-003 HS* 11 38 40.6873530648 -00 35 31.775883972   14.22 14.47 14.79   sdB1VIIeHe1 30 0
30 Feige 48 HS* 11 47 14.4978515760 +61 15 31.789400364   13.12 13.28     sdB 125 0
31 PG 1232-136 HS* 12 35 18.7430526168 -13 55 08.879064096   13.06 13.27     sdB 34 0
32 HE 1318-2111 HS* 13 21 15.6370363200 -21 27 17.629351236   14.57 14.77     sdO 20 0
33 Feige 81 HS* 13 31 53.5517863824 +15 41 17.573728740   13.24 13.507     sdBpec 53 0
34 EC 13332-1424 HS* 13 35 53.4857103648 -14 40 13.103444676   13.15 13.38 13.75   sdB 15 0
35 CD-30 11223 HS* 14 11 16.1541452856 -30 53 03.700889340   12.101 12.296 12.659 12.541 sdB+DA 78 0
36 Ton 788 HS* 15 14 32.4559114224 +24 10 40.705772196   13.03 13.21     sdB 42 0
37 PG 1519+640 HS* 15 20 31.3676002152 +63 52 08.251179924   12.03 12.18     sdB1.5VIIHe5 43 0
38 PG 1648+536 HS* 16 49 59.8505534472 +53 31 31.719097380 12.811 13.835 14.050 14.140 14.264 sdB1VIIHe0 34 0
39 [CW83] 1735+22 HS* 17 37 26.4244582176 +22 08 57.716443392   11.51 11.65     sdB+A? 33 0
40 HS 1741+2133 HS* 17 43 19.0310761944 +21 32 37.570437456   13.82 13.99 14.21   sdOB 21 0
41 PG 1743+477 HS* 17 44 26.3960708352 +47 41 46.918908168   13.68 13.79 13.99   sdB2VIIHe7 35 0
42 GALEX J175340.5-500741 HS* 17 53 40.5503241744 -50 07 42.114148464   13.280 13.066 12.931   sdB+F7V 10 0
43 ATO J291.5394+37.3356 HS* 19 26 09.4422931056 +37 20 08.163008556   13.60 13.63 14.05 13.96 sdB+dM 41 0
44 KPD 1946+4340 HS* 19 47 42.8876526504 +43 47 30.754543092 13.05 14.06 14.23 14.92   sdOB+D 62 0
45 PSO J313.8165+46.8517 HS* 20 55 15.9821496072 +46 51 06.463437624           sdOBHe 20 0
46 ZTF J213056.71+442046.5 HS* 21 30 56.7084603024 +44 20 46.448044188       15.904   sdOBHe 34 0
47 JL 82 HS* 21 36 01.2957494184 -72 48 27.222290172 11.26 12.44 12.41 12.67   sdB 42 0
48 EC 21556-5552 HS* 21 59 00.6889021608 -55 38 03.714888048 11.94 12.71 12.99     sdB 16 0
49 BPS CS 30337-0074 HS* 22 05 52.0006215384 -31 41 03.952676040   12.07 12.25     sdB 16 0
50 KPD 2215+5037 HS* 22 17 20.7353553744 +50 52 58.930200480 12.66 13.59 13.64 14.00   sdB 23 0
51 PHL 244 HS* 22 22 58.0609082424 -18 19 10.027308396   13.65 13.80 14.13   sdB 12 0
52 GALEX J223857.1+743014 HS* 22 38 57.1141215768 +74 30 15.149683368   15.384 15.348 15.513   sdB+D 13 0
53 GALEX J225444.1-551505 HS* 22 54 44.5067228904 -55 15 06.714217908   11.90 12.12 12.54   sdB 11 0
54 GD 1110 HS* 23 19 24.4299110400 -08 52 37.936761780   12.778 12.947 13.265 13.179 sdB 43 0
55 V* EQ Psc HS* 23 34 34.6314973464 -01 19 36.929325288   12.823 12.780 13.556 13.243 sdB 34 0
56 HS 2333+3927 HS* 23 35 42.5025647712 +39 44 27.064626936     14.53     sdOB 48 0
57 FBS 2347+385 HS* 23 49 47.6462597640 +38 44 41.547259860   11.65 11.73 12.03   sdB 26 0

To bookmark this query, right click on this link: simbad:objects in 2023A&A...673A..90S and select 'bookmark this link' or equivalent in the popup menu