Extrasolar Visions - HD 11977 b

» Extrasolar Planet Guide » Companions of Normal Stars » HD 11977 » HD 11977 b

Clarified Jovian, Eccentric

Object Type:

Clarified Jovian, Eccentric

Parent Star:

HD 11977 (G8.5 III)

Discovery Status:

Confirmed

Current Planet

Habitability Zone

Mass ( M sin i ):

6.54 Jupiters

Periastron Distance:

1.15 AU

Mean Distance:

1.93 AU

Apastron Distance:

2.7 AU

Orbital Period:

711 ± 8 Days

Eccentricity:

0.4 ± 0.07

Argument of Perihelion (omega):

351.5 °

System Age:

500 - 2000 Myr

Planet Appearance:

Blue and cloudless

Estimated Radius:

1.097 Jupiters ¹

Estimated Periastron Temp:

634 Kelvin

Estimated Mean Temp:

491 Kelvin

Estimated Apastron Temp:

415 Kelvin

Temp from
Internal Heating :

428.983 Kelvins ²

Max Angular Star Size:

4.667°

Mean Angular Star Size:

2.78°

Min Angular Star Size:

1.987°

Gravitational Influence
(Hill Sphere):

0.198 AU / 29710000 km

Max Stable Prograde Moon Orbit:

0.071 AU / 10690000 km

Max Moon Mass:

> 10 Earths ³

Tidally locked if older than:

> 20 Gyr ⁴

Estimated Bond Albedo:

~ 0.1 ⁵

Notes:
    ¹ from planet formation models of Burrows et al
    ² from planet formation models of Burrows et al
    ³ based on periastron due to high eccentricity
    ⁴ orbit may be too eccentric for 1:1 tidal lock
    ⁵ from Sudarsky et al. 2000

Year Discovered:

2005

Detection Method:

Doppler Spectroscopy

Discovered By:

SETIAWAN J., RODMAN J., da SILVA L., HATZES A., PASQUINI L., von der LUHE O., de MEDEIROS J., DOELLINGER M. & GIRARDI L.

One of the few planets found orbiting an evolved giant star so far, HD 11977 has a minimum mass of 6.54 Jupiters. Astrometric measurements based on Hipparcos data give a maximum mass of 65.5 Jupiters for the object, so the possibility that the object is actually a brown dwarf cannot be excluded.

The star HD 11977 itself most likely began as an A-type star, giving indirect evidence for the possibility of planets around such stars.

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