Looking for a pulse: A search for rotationally modulated radio emission from the hot Jupiter, τ BOÖTIS b

G. Hallinan, S. K. Sirothia, A. Antonova, C. H. Ishwara-Chandra, S. Bourke, J. G. Doyle, J. Hartman, A. Golden

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Hot Jupiters have been proposed as a likely population of low-frequency radio sources due to electron cyclotron maser emission of similar nature to that detected from the auroral regions of magnetized solar system planets. Such emission will likely be confined to specific ranges of orbital/rotational phase due to a narrowly beamed radiation pattern. We report on GMRT 150 MHz radio observations of the hot Jupiter τ Boötis b, consisting of 40 hr carefully scheduled to maximize coverage of the planet's 79.5 hr orbital/rotational period in an effort to detect such rotationally modulated emission. The resulting image is the deepest yet published at these frequencies and leads to a 3σ upper limit on the flux density from the planet of 1.2 mJy, two orders of magnitude lower than predictions derived from scaling laws based on solar system planetary radio emission. This represents the most stringent upper limits for both quiescent and rotationally modulated radio emission from a hot Jupiter yet achieved and suggests that either (1) the magnetic dipole moment of τ Boötis b is insufficient to generate the surface field strengths of >50 G required for detection at 150 MHz or (2) Earth lies outside the beaming pattern of the radio emission from the planet.

Original languageEnglish (US)
Article number34
JournalAstrophysical Journal
Volume762
Issue number1
DOIs
StatePublished - Jan 1 2013

Fingerprint

radio emission
Jupiter (planet)
Jupiter
planets
radio
planet
pulses
solar system
orbitals
radio observation
masers
magnetic dipoles
scaling laws
cyclotrons
field strength
dipole moments
flux density
magnetic moments
low frequencies
radiation

Keywords

  • planets and satellites: aurorae
  • planets and satellites: detection
  • planets and satellites: individual (τ Böotis b)
  • planets and satellites: magnetic fields
  • radio continuum: planetary systems

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hallinan, G., Sirothia, S. K., Antonova, A., Ishwara-Chandra, C. H., Bourke, S., Doyle, J. G., ... Golden, A. (2013). Looking for a pulse: A search for rotationally modulated radio emission from the hot Jupiter, τ BOÖTIS b. Astrophysical Journal, 762(1), [34]. https://doi.org/10.1088/0004-637X/762/1/34

Looking for a pulse : A search for rotationally modulated radio emission from the hot Jupiter, τ BOÖTIS b. / Hallinan, G.; Sirothia, S. K.; Antonova, A.; Ishwara-Chandra, C. H.; Bourke, S.; Doyle, J. G.; Hartman, J.; Golden, A.

In: Astrophysical Journal, Vol. 762, No. 1, 34, 01.01.2013.

Research output: Contribution to journalArticle

Hallinan, G, Sirothia, SK, Antonova, A, Ishwara-Chandra, CH, Bourke, S, Doyle, JG, Hartman, J & Golden, A 2013, 'Looking for a pulse: A search for rotationally modulated radio emission from the hot Jupiter, τ BOÖTIS b', Astrophysical Journal, vol. 762, no. 1, 34. https://doi.org/10.1088/0004-637X/762/1/34
Hallinan, G. ; Sirothia, S. K. ; Antonova, A. ; Ishwara-Chandra, C. H. ; Bourke, S. ; Doyle, J. G. ; Hartman, J. ; Golden, A. / Looking for a pulse : A search for rotationally modulated radio emission from the hot Jupiter, τ BOÖTIS b. In: Astrophysical Journal. 2013 ; Vol. 762, No. 1.
@article{3c921b7d6033461ea290acf857b25366,
title = "Looking for a pulse: A search for rotationally modulated radio emission from the hot Jupiter, τ BO{\"O}TIS b",
abstract = "Hot Jupiters have been proposed as a likely population of low-frequency radio sources due to electron cyclotron maser emission of similar nature to that detected from the auroral regions of magnetized solar system planets. Such emission will likely be confined to specific ranges of orbital/rotational phase due to a narrowly beamed radiation pattern. We report on GMRT 150 MHz radio observations of the hot Jupiter τ Bo{\"o}tis b, consisting of 40 hr carefully scheduled to maximize coverage of the planet's 79.5 hr orbital/rotational period in an effort to detect such rotationally modulated emission. The resulting image is the deepest yet published at these frequencies and leads to a 3σ upper limit on the flux density from the planet of 1.2 mJy, two orders of magnitude lower than predictions derived from scaling laws based on solar system planetary radio emission. This represents the most stringent upper limits for both quiescent and rotationally modulated radio emission from a hot Jupiter yet achieved and suggests that either (1) the magnetic dipole moment of τ Bo{\"o}tis b is insufficient to generate the surface field strengths of >50 G required for detection at 150 MHz or (2) Earth lies outside the beaming pattern of the radio emission from the planet.",
keywords = "planets and satellites: aurorae, planets and satellites: detection, planets and satellites: individual (τ B{\"o}otis b), planets and satellites: magnetic fields, radio continuum: planetary systems",
author = "G. Hallinan and Sirothia, {S. K.} and A. Antonova and Ishwara-Chandra, {C. H.} and S. Bourke and Doyle, {J. G.} and J. Hartman and A. Golden",
year = "2013",
month = "1",
day = "1",
doi = "10.1088/0004-637X/762/1/34",
language = "English (US)",
volume = "762",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Looking for a pulse

T2 - A search for rotationally modulated radio emission from the hot Jupiter, τ BOÖTIS b

AU - Hallinan, G.

AU - Sirothia, S. K.

AU - Antonova, A.

AU - Ishwara-Chandra, C. H.

AU - Bourke, S.

AU - Doyle, J. G.

AU - Hartman, J.

AU - Golden, A.

PY - 2013/1/1

Y1 - 2013/1/1

N2 - Hot Jupiters have been proposed as a likely population of low-frequency radio sources due to electron cyclotron maser emission of similar nature to that detected from the auroral regions of magnetized solar system planets. Such emission will likely be confined to specific ranges of orbital/rotational phase due to a narrowly beamed radiation pattern. We report on GMRT 150 MHz radio observations of the hot Jupiter τ Boötis b, consisting of 40 hr carefully scheduled to maximize coverage of the planet's 79.5 hr orbital/rotational period in an effort to detect such rotationally modulated emission. The resulting image is the deepest yet published at these frequencies and leads to a 3σ upper limit on the flux density from the planet of 1.2 mJy, two orders of magnitude lower than predictions derived from scaling laws based on solar system planetary radio emission. This represents the most stringent upper limits for both quiescent and rotationally modulated radio emission from a hot Jupiter yet achieved and suggests that either (1) the magnetic dipole moment of τ Boötis b is insufficient to generate the surface field strengths of >50 G required for detection at 150 MHz or (2) Earth lies outside the beaming pattern of the radio emission from the planet.

AB - Hot Jupiters have been proposed as a likely population of low-frequency radio sources due to electron cyclotron maser emission of similar nature to that detected from the auroral regions of magnetized solar system planets. Such emission will likely be confined to specific ranges of orbital/rotational phase due to a narrowly beamed radiation pattern. We report on GMRT 150 MHz radio observations of the hot Jupiter τ Boötis b, consisting of 40 hr carefully scheduled to maximize coverage of the planet's 79.5 hr orbital/rotational period in an effort to detect such rotationally modulated emission. The resulting image is the deepest yet published at these frequencies and leads to a 3σ upper limit on the flux density from the planet of 1.2 mJy, two orders of magnitude lower than predictions derived from scaling laws based on solar system planetary radio emission. This represents the most stringent upper limits for both quiescent and rotationally modulated radio emission from a hot Jupiter yet achieved and suggests that either (1) the magnetic dipole moment of τ Boötis b is insufficient to generate the surface field strengths of >50 G required for detection at 150 MHz or (2) Earth lies outside the beaming pattern of the radio emission from the planet.

KW - planets and satellites: aurorae

KW - planets and satellites: detection

KW - planets and satellites: individual (τ Böotis b)

KW - planets and satellites: magnetic fields

KW - radio continuum: planetary systems

UR - http://www.scopus.com/inward/record.url?scp=84871304921&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84871304921&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/762/1/34

DO - 10.1088/0004-637X/762/1/34

M3 - Article

AN - SCOPUS:84871304921

VL - 762

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 34

ER -