2013A&A...552A..65L


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.07CEST19:32:51

2013A&A...552A..65L - Astronomy and Astrophysics, volume 552A, 65-65 (2013/4-1)

Hint of 150 MHz radio emission from the Neptune-mass extrasolar transiting planet HAT-P-11b.

LECAVELIER DES ETANGS A., SIROTHIA S.K., GOPAL-KRISHNA and ZARKA P.

Abstract (from CDS):

Since the radio-frequency emission from planets is expected to be strongly influenced by their interaction with the magnetic field and corona of the host star, the physics of this process can be effectively constrained by making sensitive measurements of the planetary radio emission. Up to now, however, numerous searches for radio emission from extrasolar planets at radio wavelengths have only yielded negative results. Here we report deep radio observations of the nearby Neptune-mass extrasolar transiting planet HAT-P-11b at 150MHz, using the Giant Meterwave Radio Telescope (GMRT). On July 16, 2009, we detected a 3σ emission whose light curve is consistent with an eclipse when the planet passed behind the star. This emission is at a position 14" from the transiting exoplanet's coordinates; thus, with a synthetized beam of FWHM∼16", the position uncertainty of this weak radio signal encompasses the location of HAT-P-11. We estimate a 5% false positive probability that the observed radio light curve mimics the planet's eclipse light curve. If the faint signature is indeed a radio eclipse event associated with the planet, then its flux would be 3.87mJy±1.29mJy at 150MHz. However, our equally sensitive repeat observations of the system on November 17, 2010 did not detect a significant signal in the radio light curve near the same position. This lack of confirmation leaves us with the possibility of either a variable planetary emission, or a chance occurrence of a false positive signal in our first observation. Deeper observations are required to confirm this hint of 150MHz radio emission from HAT-P-11b.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: coronae - techniques: interferometric

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2583 2
2 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 647 1
3 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 573 1
4 BD+47 2936 EB* 19 50 50.2474562793 +48 04 51.097364378       8.8   K4V 231 2
5 BD+47 2936b Pl 19 50 50.2474562793 +48 04 51.097364378           ~ 323 1
6 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K2V 755 1
7 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1167 1
8 3C 418.0 QSO 20 38 37.0346600 +51 19 12.661988   21.30 20.00 18.9   ~ 277 0

    Equat.    Gal    SGal    Ecl

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2021.05.07-19:32:51

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