期刊
ASTROPHYSICAL JOURNAL
卷 762, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/762/1/34
关键词
planets and satellites: aurorae; planets and satellites: detection; planets and satellites: individual (iota Bootis b); planets and satellites: magnetic fields; radio continuum: planetary systems
资金
- Bulgarian National Science Fund [DDVU02/40/2010]
- Science Foundation Ireland [07/RFP/PHYF553]
- N. Ireland Department of Culture, Arts Leisure
- Science and Technology Facilities Council [ST/H001921/1] Funding Source: researchfish
- STFC [ST/H001921/1] Funding Source: UKRI
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 iota Bootis 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 3 sigma 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 iota Bootis 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据