2005A&A...433L..21P

Query : 2005A&A...433L..21P

2005A&A...433L..21P - Astronomy and Astrophysics, volume 433, L21-24 (2005/4-2)

A planet-sized transiting star around OGLE-TR-122. Accurate mass and radius near the hydrogen-burning limit.

PONT F., MELO C.H.F., BOUCHY F., UDRY S., QUELOZ D., MAYOR M. and SANTOS N.C.

Abstract (from CDS):

We report the discovery and characterisation of OGLE-TR-122b, the smallest main-sequence star to date with a direct radius determination. OGLE-TR-122b transits around its solar-type primary every 7.3-days. With M=0.092±0.009M_☉ and R=0.120^+0.020_–0.013R_☉, it is by far the smallest known eclipsing M-dwarf. The derived mass and radius for OGLE-TR-122b are in agreement with the theoretical expectations. OGLE-TR-122b is the first observational evidence that stars can indeed have radii comparable or even smaller than giant planets. In such cases, the photometric signal is exactly that of a transiting planet and the true nature of the companion can only be determined with high-resolution spectroscopy.

Abstract Copyright: ∼

Journal keyword(s): stars: low-mass, brown-dwarfs - stars: fundamental parameters - stars: binaries - binaries: eclipsing

Simbad objects: 13

Full paper

View the references in ADS

Number of rows : 13

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	HD 33793	PM*	05 11 40.5898395497	-45 01 06.361734876	11.624	10.433	8.853	7.9	6.899	M1VIp	327	0
2	NAME OGLE-TR-111b	Pl	10 53 17.8066842748	-61 24 20.606379347						~	114	1
3	V* V764 Car	EB*	10 53 51.1166673312	-61 34 13.644573348			17.71		16.53	~	22	0
4	V* V783 Car	EB*	10 57 51.8344468224	-61 43 58.834463808			16.431		15.82	~	13	0
5	V* V796 Car	EB*	10 59 41.5134006792	-61 55 15.606483168			16.24		15.45	~	15	0
6	V* V811 Car	EB*	11 05 58.9647251064	-61 10 08.524646976			17.78		16.44	~	7	0
7	V* V817 Car	EB*	11 06 51.8853827760	-60 51 45.902051712			16.809		15.61	~	33	1
8	NAME OGLE-TR 122B	BD?	11 06 51.99	-60 51 45.7						~	20	1
9	NAME Proxima Centauri	Er*	14 29 42.9461331854	-62 40 46.164680672	14.21	12.95	11.13	9.45	7.41	M5.5Ve	1245	0
10	V* CM Dra	BY*	16 34 20.3302660573	+57 09 44.368918696		14.50	12.87	10.85	9.26	M4.5V	433	0
11	V* V5126 Sgr	EB*	17 51 49.34	-30 01 44.4			15.783		14.88	F0V	17	0
12	V* V5128 Sgr	EB*	17 52 08.66	-29 56 12.1			15.900		14.79	~	18	0
13	NAME Barnard's star	BY*	17 57 48.4984700685	+04 41 36.113879676	12.497	11.24	9.511	8.298	6.741	M4V	796	2

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