2017AJ....153..152S


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.21CET06:02:05

2017AJ....153..152S - Astron. J., 153, 152-152 (2017/April-0)

Orbiting clouds of material at the Keplerian co-rotation radius. Of rapidly rotating low-mass WTTs in Upper Sco.

STAUFFER J., COLLIER CAMERON A., JARDINE M., DAVID T.J., REBULL L., CODY A.M., HILLENBRAND L.A., BARRADO D., WOLK S., DAVENPORT J. and PINSONNEAULT M.

Abstract (from CDS):

Using K2 data, we identified 23 very-low-mass members of the ρ Oph and Upper Scorpius star-forming region as having periodic photometric variability not easily explained by well-established physical mechanisms such as star spots, eclipsing binaries, or pulsation. All of these unusual stars are mid-to-late M dwarfs without evidence of active accretion, and with photometric periods generally <1 day. Often the unusual light-curve signature takes the form of narrow flux dips; when we also have rotation periods from star spots, the two periods agree, suggesting that the flux dips are due to material orbiting the star at the Keplerian co-rotation radius. We sometimes see "state-changes" in the phased light-curve morphologies where ∼25% of the waveform changes shape on timescales less than a day; often, the "state-change" takes place immediately after a strong flare. For the group of stars with these sudden light-curve morphology shifts, we attribute their flux dips as most probably arising from eclipses of warm coronal gas clouds, analagous to the slingshot prominences postulated to explain transient Hα absorption features in AB Doradus and other rapidly rotating late-type stars. For another group of stars with somewhat longer periods, we find the short-duration flux dips to be highly variable on both short and long timescales, with generally asymmetric flux-dip profiles. We believe that these flux dips are due to particulate clouds possibly associated with a close-in planet or resulting from a recent collisional event.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): stars: low-mass - stars: pre-main sequence - stars: pre-main sequence

Simbad objects: 41

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Number of rows : 41

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 Cl* Melotte 22 DH 138 * 03 40 25.6094747865 +24 06 00.322187942     18.45   15.35 ~ 13 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2924 0
3 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3355 0
4 NAME 25 Ori Group OpC 05 24 36 +01 48.0           ~ 84 1
5 CVSO 30 TT* 05 25 07.5563565811 +01 34 24.349287546     16.26 15.88 13.70 M3 32 1
6 HD 36705 TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 920 0
7 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1921 1
8 * sig Ori E Y*O 05 38 47.2050001416 -02 35 40.514907495 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 394 0
9 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1559 1
10 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1190 0
11 K2-22b Pl 11 17 55.8771414480 +02 37 08.603887613           ~ 35 0
12 RIK 21 Y*O 15 56 25.107816 -20 16 15.79404       16.01   M5.0e 5 0
13 UScoCTIO 80 Ro* 15 58 35.9861312085 -23 48 13.819466995   19.8   17.3 15.07 ~ 11 0
14 UCAC3 133-177729 Ro* 15 58 36.2187524687 -23 48 01.994147841   17.33 15.66 15.58 12.71 ~ 7 0
15 2MASS J15593807-2603233 Y*O 15 59 38.0719624895 -26 03 23.387586402           M5.5e 4 0
16 UCAC2 22721716 Ro* 16 01 21.560 -22 37 26.45   16.9       M4 11 1
17 EPIC 204897050 Ro* 16 01 40.9810602222 -20 22 08.094200531           M5 8 0
18 2MASS J16085695-2835573 Y*O 16 08 56.9528635491 -28 35 57.420954321           M4.5e 4 0
19 2MASS J16095287-2441535 Y*O 16 09 52.8841527390 -24 41 53.557336476           M5.5e 6 0
20 EPIC 205024957 Ro* 16 10 11.0063518449 -19 46 03.943175326   18.9       M5 18 0
21 EPIC 205046529 Ro* 16 10 26.393 -19 39 51.33   17.4       M4 15 0
22 2MASS J16103162-2516017 BD* 16 10 31.6229616735 -25 16 01.800188820           M4 4 0
23 2MASS J16110212-2335504 BD* 16 11 02.1172770568 -23 35 50.550045212           M5.0 8 0
24 2MASS J16111813-1757286 pr* 16 11 18.1316653110 -17 57 28.751171016   16.5 15.357     M4 16 0
25 2MASS J16115439-2236491 BD* 16 11 54.3997786228 -22 36 49.180634545           M6.25 12 0
26 NAME Upper Sco Association As* 16 12 -23.4           ~ 971 1
27 EPIC 203534383 Ro* 16 14 02.9915424204 -25 48 53.162774395           M4 4 0
28 UCAC4 354-076909 Ro* 16 15 19.7012010905 -19 21 07.282703434       14.35   ~ 2 0
29 2MASS J16155926-2329363 BD* 16 15 59.2633482350 -23 29 36.355550445           M5.0 9 0
30 EPIC 202873945 Ro* 16 21 39.9219155352 -28 03 06.759905589           ~ 3 0
31 2MASS J16232454-1717270 pr* 16 23 24.5435722909 -17 17 27.143929095           M2.5e 10 0
32 EPIC 204296148 Ro* 16 24 51.8109097850 -22 53 42.849304743           ~ 2 0
33 BKLT J162650-241354 Y*O 16 26 50.4919594909 -24 13 52.250275438       16.82 14.78 M4.5 10 0
34 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2954 0
35 BKLT J162843-242253 TT* 16 28 43.0590118508 -24 22 52.207112294       16.54 14.47 M4.75 9 0
36 2MASS J16310579-2725460 Y*O 16 31 05.7965029452 -27 25 46.138426235           M4.5e 4 0
37 2MASS J16343514-2658030 Y*O 16 34 35.1406299213 -26 58 03.055108618           M4.5e 4 0
38 KOI-3794 Ro* 19 23 51.8899069766 +51 30 16.983558676           ~ 59 1
39 NAME KIC 12557548b Pl? 19 23 51.8899069766 +51 30 16.983558676           ~ 56 1
40 V* BO Mic BY* 20 47 44.9892114361 -36 35 40.819135413   10.39 9.337   8.216 K3V(e) 162 0
41 V* V374 Peg Fl* 22 01 13.1233106147 +28 18 24.913041858       11.602   M3.5Ve 161 0

    Equat.    Gal    SGal    Ecl

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2020.01.21-06:02:05

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