WISEP J060738.65+242953.4: A NEARBY POLE-ON L8 BROWN DWARF WITH RADIO EMISSION
- Department of Physics and Astronomy, University of Delaware, Newark, DE 19716 (United States)
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
- Center for Astrophysics and Space Science, University of California San Diego, La Jolla, CA 92093 (United States)
- Dipartimento di Fisica e Astronomia, Università di Padova, Vicolo dell’Osservatorio 3, Padova, I-35122 (Italy)
- INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, Padova, I-35122 (Italy)
We present a simultaneous, multi-wavelength campaign targeting the nearby (7.2 pc) L8/L9 (optical/near-infrared) dwarf WISEP J060738.65+242953.4 in the mid-infrared, radio, and optical. Spitzer Space Telescope observations show no variability at the 0.2% level over 10 hr each in the 3.6 and 4.5 μ m bands. Kepler K2 monitoring over 36 days in Campaign 0 rules out stable periodic signals in the optical with amplitudes greater than 1.5% and periods between 1.5 hr and 2 days. Non-simultaneous Gemini optical spectroscopy detects lithium, constraining this L dwarf to be less than ∼2 Gyr old, but no Balmer emission is observed. The low measured projected rotation velocity ( v sin i < 6 km s{sup −1}) and lack of variability are very unusual compared to other brown dwarfs, and we argue that this substellar object is likely viewed pole-on. We detect quiescent (non-bursting) radio emission with the Very Large Array. Among radio-detected L and T dwarfs, it has the lowest observed L{sub ν} and the lowest v sin i . We discuss the implications of a pole-on detection for various proposed radio emission scenarios.
- OSTI ID:
- 22662949
- Journal Information:
- Astronomical Journal (Online), Vol. 152, Issue 5; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
Similar Records
DISCOVERY OF A LATE L DWARF: WISEP J060738.65+242953.4
DISCOVERY OF FOUR HIGH PROPER MOTION L DWARFS, INCLUDING A 10 pc L DWARF AT THE L/T TRANSITION {sup ,}