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Proposal Identification No.:

A2856

Date Received:

2013-Aug-23 12:02:18

Technical Page
This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT:
We have recently used the Arecibo telescope and the Mock spectrometer to make timing measurements of an ultracool dwarf (UCD), TVLM 513-46546, at 5 GHz. The astonishing result of these measurements was that the 1.96 hour period of radio flares from this ob ject had been systematically decreasing over 6 months in 2012/2013 at the average rate of 10 ms/day. A plausible explanation of this effect is that it is caused by a differential rotation of the dwarf, combined with the migration of radio active regions toward the equator, in a manner similar to the behavior of sunspots that create the famous "butterfly" diagram for the Sun. If true, this would be the first detection of a differential rotation of an UCD, and a demonstration of the usefulness of flare timing as a tool to better understand the internal structure of these ob jects. We propose to observe TVLM 513 and two other similar UCDs to verify the above idea and to explore any alternative interpretations of our observations.

Regular Astronomy Continuum Galactic 100 Hours 2 hours

Timing the periodically flaring ultracool dwarfs, TVLM 513-46546, 2M J0746+2000, and LSR 1835+3259

Name Alexander Wolszczan

Institution Penn State University

E-mail alex@astro.psu.edu

Phone 814 863 1756

Student no

Remote Observing Request

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

Instrument Setup
C Atmospheric Observation Instruments:

1


Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
4200 - 5100

2