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Proposal Identification No.:

A3024 Arecibo Observatory

Date Received: 2015-Aug-23 11:27:57 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2015. This proposal has been submitted before. The previous proposal number is 3024. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Stellar 14 30 1.25 hr 100-500 GB

The Continuing TY Brown Dwarf Survey

Brown dwarfs lie between giant planets and M dwarf stars in terms of mass, but share properties that overlap with both classes of ob jects. While searches for radio emission from giant exoplanets have been in vain, at the higher end of this mass range, Route and Wolszczan (2012) have reported the revolutionary discovery of a T6.5 radio-flaring brown dwarf with a 900K temperature. This source and another recently detected T dwarf , J1122+25 (Route and Wolszczan 2015), emit radio flares with high brightness temperatures and large circular polarization fractions via the electron cyclotron maser, which occurs in both cool stars and magnetized Solar System planets. This proposal continues the exploration of the TY spectral range initiated in the Spring 2015 proposal, in a quest to learn more about the radio emission, plasma environments, and magnetic properties of progressively cooler, less massive substellar ob jects that become increasingly similar to giant exoplanets. Outreach Abstract: Brown dwarfs lie between giant planets and M dwarf stars in terms of mass, but share properties that overlap with both classes of ob jects. While searches for radio emission from giant exoplanets have been in vain, at the higher end of this mass range, Route and Wolszczan (2012) have reported the revolutionary discovery of a T6.5 radio-flaring brown dwarf with a 900K temperature, or merely five times that of Jupiter. This source and another recently detected T dwarf, J1122+25 (Route and Wolszczan 2015), emit radio flares that are triggered by the same mechanism in both cool stars and magnetized Solar System planets. This proposal will explore the TY spectral type range of brown dwarfs (temperatures <1400 K) in a quest to learn more about the radio emission, plasma environments, and magnetic properties of progressively cooler, less massive substellar ob jects that become increasingly similar to giant exoplanets.

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Name Matthew P Route

Institution Purdue University

E-mail mroute@purdue.edu

Phone 303-550-4269

Student 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 ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) The right ascensions of the sources are given in Table 1 in my proposal. I require a minimum of 1 hour per source, as the time is available. The observations are very flexible and do not need to be grouped together in any way.

Section I I I - Instruments Needed
C Atmospheric Observation Instruments:

Sp ecial Equipment or setup: Mock spectrometer

Section IV - RFI Considerations
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Frequency Ranges Planned
4250 - 5250

Section V - Observing List Target List
WISEPJ032547.72+083118.2 03:25:47.7 8:31:18.0 02:16:13 04:37:01 WISEPAJ041022.71+150248.5 04:10:22.1 15:03:11.0 02:50:05 05:32:23 SDSSJ075840.33+324723.4 07:58:40.4 32:47:25.0 06:59:47 08:59:32 WISEPCJ121756.91+162640.2 12:17:56.9 16:26:40.0 10:56:36 13:40:52 SDSSJ123147.38+084730.7 12:31:47.5 8:47:33.0 11:21:51 13:43:19 SDSSJ141624.08+134826.7B 14:16:23.9 13:48:36.0 12:57:24 15:36:52 SDSSJ150319.64+252522.4 15:03:19.6 25:25:20.0 13:44:33 16:23:25

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