2015A&A...584A.128L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST22:01:45

2015A&A...584A.128L - Astronomy and Astrophysics, volume 584A, 128-128 (2015/12-1)

An eclipsing double-line spectroscopic binary at the stellar/substellar boundary in the Upper Scorpius OB association.

LODIEU N., ALONSO R., GONZALEZ HERNANDEZ J.I., SANCHIS-OJEDA R., NARITA N., KAWASHIMA Y., KAWAUCHI K., SUAREZ MASCARENO A., DEEG H., PRIETO ARRANZ J., REBOLO R., PALLE E., BEJAR V.J.S., FERRAGAMO A. and RUBINO-MARTIN J.A.

Abstract (from CDS):

We aim at constraining evolutionary models at low mass and young ages by identifying interesting transiting system members of the nearest OB association to the Sun, Upper Scorpius (USco), which has been targeted by the Kepler mission. We produced light curves for M-dwarf members of the USco region that has been surveyed during the second campaign of the Kepler K2 mission. We identified by eye a transiting system, UScoJ161630.68-251220.1 (=EPIC203710387) with a combined spectral type of M5.25, whose photometric, astrometric, and spectroscopic properties makes it a member of USco. We conducted an extensive photometric and spectroscopic follow-up of this transiting system with a suite of telescopes and instruments to characterise the properties of each component of the system. We calculated a transit duration of about 2.42h that occurs every 2.88-days with a slight difference in transit depth and phase between the two components. We estimated a mass ratio of 0.922±0.015 from the semi-amplitudes of the radial velocity curves for each component. We derived masses of 0.091±0.005M and 0.084±0.004M, radii of 0.388±0.008R and 0.380±0.008R, luminosities of log(L/L)=-2.020–0.121+0.099dex and -2.032–0.121+0.099dex, and effective temperatures of 2901–172+199K and 2908–172+199K for the primary and secondary, respectively. We present a complete photometric and radial velocity characterisation of the least massive double-line eclipsing binary system in the young USco association with two components close to the stellar/substellar limit. This system falls in a gap between the least massive eclipsing binaries in the low-mass and substellar regimes at young ages and represents an important addition to constraining evolutionary models at young ages.

Abstract Copyright:

Journal keyword(s): techniques: photometric - open clusters and associations: individual: Upper Scorpius OB association - techniques: spectroscopic - stars: low-mass

Simbad objects: 23

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Number of rows : 23

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 KELT-1b Pl 00 01 26.9169325133 +39 23 01.782142922           ~ 61 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2979 0
3 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2654 0
4 * psi01 Ori Be* 05 24 44.8269466961 +01 50 47.202396831 3.83 4.76 4.96 5.04 5.26 B1Vn 322 0
5 2MASS J05351214-0531388 Y*O 05 35 12.1463732749 -05 31 38.821108760 19.716 18.292 17.169 15.68 13.554 M5 52 0
6 V* V2384 Ori Al* 05 35 21.8463185314 -05 46 08.560286991       19.21 17.28 M7 87 1
7 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1588 1
8 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1224 0
9 NAME eta Cha Association MGr 08 42 06 -79 01.6           ~ 306 0
10 FBS 1109+767 EB* 11 12 42.3412918233 +76 26 56.388992336   16.1   14.8   M4V 48 0
11 HD 142184 Be* 15 53 55.86404 -23 58 41.1522 4.77 5.352 5.402     B2V 200 0
12 UScoCTIO 5 EB* 15 59 50.5087554948 -19 44 37.367864195           M4e 34 0
13 HD 144548 Al* 16 07 17.7851617901 -22 03 36.555731668   9.37 8.752   7.868 F7V 44 0
14 HD 144588 * 16 07 36.2206808358 -25 37 00.200840566   10.50 9.93     F6/7V 4 0
15 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1
16 DENIS J161630.6-251220 LM* 16 16 30.6747602967 -25 12 20.220097892   19.5   17.3 15.042 M4.5V-M5V+M4.5V-M5V 23 0
17 Ross 640 WD* 16 28 25.0030292072 +36 46 15.849157470   14.01   13.9   DZA5.5 168 0
18 V* CM Dra BY* 16 34 20.3299130309 +57 09 44.365524588   14.50 12.87 10.85 9.26 M4.5V 403 0
19 EWS 2013-BLG-102 * 17 52 07.0810869490 -31 41 26.128240598           ~ 7 0
20 NAME Barnard's star BY* 17 57 48.4997994034 +04 41 36.111354228 12.497 11.24 9.511 8.298 6.741 M4V 655 2
21 HD 164922 PM* 18 02 30.8624729311 +26 18 46.803383047   7.79   6.5   G9V 179 1
22 CoRoT-3b Pl 19 28 13.2642482783 +00 07 18.614302248           ~ 114 1
23 Kepler-39b Pl 19 47 50.4745660177 +46 02 03.499173435           ~ 46 1

    Equat.    Gal    SGal    Ecl

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2020.07.14-22:01:45

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