2013ApJ...771...42A


Query : 2013ApJ...771...42A

2013ApJ...771...42A - Astrophys. J., 771, 42 (2013/July-1)

Two planetary companions around the K7 dwarf GJ 221: a hot super-earth and a candidate in the Sub-Saturn desert range.

ARRIAGADA P., ANGLADA-ESCUDE G., BUTLER R.P., CRANE J.D., SHECTMAN S.A., THOMPSON I., WENDE S. and MINNITI D.

Abstract (from CDS):

We report two low-mass companions orbiting the nearby K7 dwarf GJ 221 that have emerged from reanalyzing 4.4 yr of publicly available HARPS spectra complemented with 2 years of high-precision Doppler measurements with Magellan/PFS. The HARPS measurements alone contain the clear signal of a low-mass companion with a period of 125 days and a minimum mass of 53.2 M⊕(GJ 221b), falling in a mass range where very few planet candidates have been found (sub-Saturn desert). The addition of 17 PFS observations allows the confident detection of a second low-mass companion (6.5 M⊕) in a hot orbit (3.87 day period, GJ 221c). Spectroscopic and photometric calibrations suggest that GJ 221 is slightly depleted ([Fe/H] ∼ -0.1) compared to the Sun, so the presence of two low-mass companions in the system confirms the trend that slightly reduced stellar metallicity does not prevent the formation of planets in the super-Earth to sub-Saturn mass regime.

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Journal keyword(s): planetary systems - stars: individual (GJ 221, BD-061339)

Simbad objects: 7

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Number of rows : 7
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 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1354 1
2 BD-06 1339c Pl 05 53 00.2846861073 -05 59 41.441196105           ~ 13 1
3 BD-06 1339b Pl 05 53 00.2846861073 -05 59 41.441196105           ~ 15 1
4 BD-06 1339 PM* 05 53 00.2846861073 -05 59 41.441196105 12.27 11.041 9.693 8.855 8.099 K7V/M0V 106 1
5 HD 53706 PM* 07 03 58.9212523543 -43 36 40.873487765 7.978 7.632 6.851 6.427 6.013 K0.5V 148 0
6 BD-11 2741 PM* 09 51 09.6399896923 -12 19 47.479148223 12.595 11.478 10.016 9.078 8.073 dM0.5 131 0
7 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1

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