Discovery of a Late L Dwarf: Wisep J060738.65+242953.4

Castro, Philip J.; Gizis, John E.

doi:10.1088/0004-637x/746/1/3

Cited by 20 publications

(26 citation statements)

References 34 publications

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“…A consequence of two all-sky surveys with wavelengths in the near-infrared and mid-infrared, with a difference in epochs of ∼10 yr, is that it creates an ideal setup to search for ultracool dwarfs with large proper motion. Multi-epoch searches using WISE have proven successful at discovering high proper motion ultracool dwarfs (Aberasturi et al 2011;Liu et al 2011;Loutrel et al 2011;Gizis et al 2011aGizis et al , 2011bScholz et al 2011;Castro & Gizis 2012;Gizis et al 2012;Luhman et al 2012;Luhman 2013).…”

Section: Introductionmentioning

confidence: 99%

DISCOVERY OF FOUR HIGH PROPER MOTION L DWARFS, INCLUDING A 10 pc L DWARF AT THE L/T TRANSITION^,

Castro¹,

Gizis²,

Harris³

et al. 2013

ApJ

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We discover four high proper motion L dwarfs by comparing the Wide-field Infrared Survey Explorer (WISE) to the Two Micron All Sky Survey. WISE J140533.32+835030.5 is an L dwarf at the L/T transition with a proper motion of 0.85 ± 0. 02 yr −1 , previously overlooked due to its proximity to a bright star (V ≈ 12 mag). From optical spectroscopy we find a spectral type of L8, and from moderate-resolution J band spectroscopy we find a near-infrared spectral type of L9. We find WISE J140533.32+835030.5 to have a distance of 9.7 ± 1.7 pc, bringing the number of L dwarfs at the L/T transition within 10 pc from six to seven. WISE J040137.21+284951.7, WISE J040418.01+412735.6, and WISE J062442.37+662625.6 are all early L dwarfs within 25 pc, and were classified using optical and low-resolution near-infrared spectra. WISE J040418.01+412735.6 is an L2 pec (red) dwarf, a member of the class of unusually red L dwarfs. We use follow-up optical and low-resolution near-infrared spectroscopy to classify a previously discovered fifth object WISEP J060738.65+242953.4 as an (L8 Opt/L9 NIR), confirming it as an L dwarf at the L/T transition within 10 pc. WISEP J060738.65+242953.4 shows tentative CH 4 in the H band, possibly the result of unresolved binarity with an early T dwarf, a scenario not supported by binary spectral template fitting. If WISEP J060738.65+242953.4 is a single object, it represents the earliest onset of CH 4 in the H band of an L/T transition dwarf in the SpeX Library. As very late L dwarfs within 10 pc, WISE J140533.32+835030.5 and WISEP J060738.65+242953.4 will play a vital role in resolving outstanding issues at the L/T transition.

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Section: Introductionmentioning

confidence: 99%

DISCOVERY OF FOUR HIGH PROPER MOTION L DWARFS, INCLUDING A 10 pc L DWARF AT THE L/T TRANSITION^,

Castro¹,

Gizis²,

Harris³

et al. 2013

ApJ

Self Cite

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“…While adding to this list may superficially appear to be an example of incremental "postage stamp collecting," it is better seen as a search for favorable astrophysical laboratories. Notably, WISEP J180026.60+013453.1 (Gizis et al 2011) is an L7.5 dwarf at an estimated distance of 8.8 ± 1.0 pc and WISEP J060738.65+242953.4 (Castro & Gizis 2012a) is an L9 dwarf at 7.8 +1.4 −1.2 pc, the latter of which is only the third known L dwarf within 8 pc (Kirkpatrick et al 2012). Another important object is WISE J140533.32+835030.5 (Castro et al 2012b), an L9 at 9.7 ± 1.7 pc, which was overlooked due to a nearby bright background star.…”

Section: Comparing Wise To Other Surveysmentioning

confidence: 99%

Furthering our knowledge of the solar neighborhood using WISE

et al. 2013

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The launch of NASA's Wide‐field Infrared Survey Explorer (WISE) in late 2009 ushered in an new era in the study of the solar neighborhood. Its mid‐infrared capabilities have proven critical to the discovery of the bulk of the coolest (Teff < 1000 K) brown dwarfs, including the new Y dwarfs, and its all‐sky coverage lends itself to searches for high proper motions stars using other infrared surveys such as the Two Micron All Sky Survey (2MASS), UKIRT Infrared Deep Sky Survey (UKIDSS), and Visible and Infrared Survey Telescope for Astronomy (VISTA) surveys. This splinter session of the 17th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun was organized to bring together researchers working with WISE data to both identify brown dwarfs and characterize their properties. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…Thus, the discovery of rapidly and slowly rotating UCDs is important not only to unlock the secrets of their internal dynamos that give rise to large-scale, kG magnetic fields, but also to aid our understanding of their angular momentum evolution. Castro & Gizis (2012) indentified WISEP J060738.65+242953.4 (J0607+24) during a search for sources detected in the Wide-field Infrared Survey Explorer (WISE) catalog without corresponding nearby Two Micron All Sky Survey (2MASS) sources within 3", thereby indicating their large proper motions. They computed a 7.8 +1.4 −1.2 pc distance to the object based on averaging the results of absolute magnitude versus spectral type relationships that utilized the 2MASS J, H, and K S (Looper et al 2008), and SDSS i and z (Schmidt et al 2010) bands.…”

Section: Introductionmentioning

confidence: 99%

Is WISEP J060738.65+242953.4 Really a Magnetically Active, Pole-on L Dwarf?

Route

2017

ApJ

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The interplay of rotation and manifested magnetic activity on ultracool dwarfs (UCDs) is of key importance for gathering clues as to the operation of the dynamos within these objects. A number of magnetized UCDs host kG-strength magnetic fields. It was recently reported that the L8 dwarf WISEP J060738.65+242953.4 is a radio-emitting UCD that is likely observed pole-on, due to its lack of photometric variability and narrow spectral lines. Follow-up radio observations at Arecibo Observatory, together with careful analysis of previously published details, however, suggest that the scientific and statistical significance of the radio and spectroscopic data have been overstated. If the UCD is observed along its aligned spin/magnetic axis, the absence of observed Hα activity may present challenges to the auroral model of UCD magnetism, although short or long-term cyclic magnetic activity may explain this behavior. Monte Carlo simulations presented here suggest that the source probably rotates with v sin i=6-12 km s −1 , indicating that its inclination angle and rotational velocity are unexceptional and that its angular momentum has evolved as expected for brown dwarfs observed in ∼1 Myr-old clusters. The discovery and verification of the most rapidly and slowest rotating brown dwarfs place valuable constraints on the angular momentum evolution and magnetic activity history of these objects.

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Discovery of a Late L Dwarf: Wisep J060738.65+242953.4

Cited by 20 publications

References 34 publications

DISCOVERY OF FOUR HIGH PROPER MOTION L DWARFS, INCLUDING A 10 pc L DWARF AT THE L/T TRANSITION^,

DISCOVERY OF FOUR HIGH PROPER MOTION L DWARFS, INCLUDING A 10 pc L DWARF AT THE L/T TRANSITION^,

Furthering our knowledge of the solar neighborhood using WISE

Is WISEP J060738.65+242953.4 Really a Magnetically Active, Pole-on L Dwarf?

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Discovery of a Late L Dwarf: Wisep J060738.65+242953.4

Cited by 20 publications

References 34 publications

DISCOVERY OF FOUR HIGH PROPER MOTION L DWARFS, INCLUDING A 10 pc L DWARF AT THE L/T TRANSITION,

DISCOVERY OF FOUR HIGH PROPER MOTION L DWARFS, INCLUDING A 10 pc L DWARF AT THE L/T TRANSITION,

Furthering our knowledge of the solar neighborhood using WISE

Is WISEP J060738.65+242953.4 Really a Magnetically Active, Pole-on L Dwarf?

Contact Info

Product

Resources

About

DISCOVERY OF FOUR HIGH PROPER MOTION L DWARFS, INCLUDING A 10 pc L DWARF AT THE L/T TRANSITION^,

DISCOVERY OF FOUR HIGH PROPER MOTION L DWARFS, INCLUDING A 10 pc L DWARF AT THE L/T TRANSITION^,