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Proposal Identification No.:

A2857 Arecibo Observatory

Date Received: 2013-Sep-03 12:43:32 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2013. This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours Next Semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: Regular Astronomy Continuum Galactic 30 20

2 hours less than 100 GB

A multifrequency search for flaring radio emission from the HR 8799 planetary

system
ABSTRACT: Detection of radio emission from exoplanets has a potential to create a unique experimental basis for studies of their magnetic fields. Such measurements would provide a way to constrain the models of dynamo generation and hence the internal structure of these ob jects. In addition, placing useful constraints on the existence and properties of magnetic fields of exoplanets would obviously enrich the investigations of planetary habitability. All the previous, low frequency searches for such emissions from hot Jupiter type exoplanets have been unsuccessful. We propose to search for radio flares from the well-known, four-planet system, HR7899, with the Arecibo telescope and the Mock spectrometer at 327 MHz, 1.4, and 3 GHz. Our survey is based on the theoretical prediction that young, hot exoplanet may have magnetic fields that are strong enough to produce radio emission via the cyclotron maser mechanism at GHz frequencies. Outreach Abstract: Measurements of the magnetic fields of various types of the celestial bodies teach us much about their physics. In the case of planets, the presence or absence of a planetary magnetic field is also one of the important factors that determine their habitability. The most promising way to detect such magnetic fields in the cool, planet-mass bodies is through searches for their radio emission. This is because rapidly moving electrons in a planetary magnetosphere radiate at radio frequencies and these emissions may be powerful enough to be detectable. Observations of radio emission from the Solar System planets is easy, because of their proximity. However, because the exoplanets are much farther away, attempts to detect their radio emission have been unsuccessful. We propose to search for radio emission from the HR 8799 planetary system, which consists of four young planets that are still hot enough to maintain strong magnetic fields. Therefore, they may still be capable of generating radi

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Name Alexander Wolszczan Thomas Henning

Institution Penn State University Max Planck Institut fuer Astronomie, Heidelberg

E-mail alex@astro.psu.edu henning@mpia.de

Phone 814 863 1756 +49 6221 528 200

Student no no

This work is not part of a thesis.

Remote Observing Request

Observer will travel to AO X Remote Observing In Absentia (instructions to operator)

Section I I - Time Request
The following times are in LST. For these observations night-time is required.

Begin ­ End Interval­Interval 22:00 ­ 0:00 ­ ­ ­

Days Needed at This Interval 14

Time Constraints (Must Be Justified in the Prop osal Text) We need to avoid daytime observing that we can start observing in June the spring semester. This is why we semester. The proposed way to split actual circumstances. because of both the man-made and solar interference. This means 2014, but will likely be unable to complete the pro ject by the end of are requesting part of our time to be allocated in the following the time allocation can obviously be changed depending on the

Next Semester Time Request

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Begin ­ End Interval­Interval 22:00 ­ 0:00 ­ ­ ­

Days Needed at This Interval 10

Time Constraints (Must Be Justified in the Prop osal Text) See above.

Section I I I - Instruments Needed
L-wide 327 S-high

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
302-352 1150-1750 3000-4000

Section V - Observing List Target List
RA: 23:07:29 DEC: 21:08:03

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