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The Pan-STARRS1 Proper-motion Survey for Young Brown Dwarfs in Nearby Star-forming Regions. I. Taurus Discoveries and a Reddening-free Classification Method for Ultracool Dwarfs
Zhoujian Zhang, Michael C. Liu, William M. J. Best +11
We are conducting a proper-motion survey for young brown dwarfs in the Taurus-Auriga molecular cloud based on the Pan-STARRS1 3 Survey. Our search uses multi-band photometry and…
A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE. III. Young L Dwarf Discoveries and Proper Motion Catalogs in Taurus and Scorpius-Centaurus
William M. J. Best, Michael C. Liu, Eugene A. Magnier +13
We present the discovery of eight young M7-L2 dwarfs in the Taurus star-forming region and the Scorpius-Centaurus OB Association, serendipitously found during a wide-field search f…
2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary
N. R. Deacon, E. A. Magnier, Michael C. Liu +14
We present the discovery of a 360 AU separation T3 companion to the tight (3.1 AU) M4.5+M6.5 binary 2MASS J02132062+3648506. This companion was identified using Pan-STARRS1 data an…
Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3 Survey
William M. J. Best, Eugene A. Magnier, Michael C. Liu +12
We present a catalog of 9888 M, L and T dwarfs detected in the Pan-STARRS1 3 Survey (PS1), covering three-quarters of the sky. Our catalog contains nearly all known objects of s…
A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE. II. L/T Transition Atmospheres and Young Discoveries
William M. J. Best, Michael C. Liu, Eugene A. Magnier +13
The evolution of brown dwarfs from L to T spectral types is one of the least understood aspects of the ultracool population, partly for lack of a large, well-defined, and well-char…
M Dwarf Activity in the Pan-STARRS 1 Medium-Deep Survey: First Catalog and Rotation Periods
Erin Kado-Fong, Peter K. G. Williams, Andrew W. Mann +9
We report on an ongoing project to investigate activity in the M dwarf stellar population observed by the Pan-STARRS 1 Medium Deep Survey (PS1-MDS). Using a custom-built pipeline,…
Brown Dwarfs in Young Moving Groups from Pan-STARRS1. I. AB Doradus
Kimberly M. Aller, Michael C. Liu, Eugene A. Magnier +11
Substellar members of young (150 Myr) moving groups are valuable benchmarks to empirically define brown dwarf evolution with age and to study the low-mass end of the init…
A Pan-STARRS1 study of the relationship between wide binarity and planet occurrence in the Kepler field
N. R. Deacon, A. L. Kraus, A. W. Mann +9
The NASA Kepler mission has revolutionised time-domain astronomy and has massively expanded the number of known extrasolar planets. However, the effect of wide multiplicity on exop…
Total eclipse of the heart: The AM CVn Gaia14aae / ASSASN-14cn
H. C. Campbell, T. R. Marsh, M. Fraser +82
We report the discovery and characterisation of a deeply eclipsing AM CVn-system, Gaia14aae (= ASSASN-14cn). Gaia14aae was identified independently by the All-Sky Automated Survey…
The fastest unbound star in our Galaxy ejected by a thermonuclear supernova
S. Geier, F. Fürst, E. Ziegerer +17
Hypervelocity stars (HVS) travel with velocities so high, that they exceed the escape velocity of the Galaxy. Several acceleration mechanisms have been discussed. Only one HVS (US…
Properties of M31. V: 298 Eclipsing Binaries from PAndromeda
C. -H. Lee, J. Koppenhoefer, S. Seitz +12
The goal of this work is to conduct a photometric study of eclipsing binaries in M31. We apply a modified box-fitting algorithm to search for eclipsing binary candidates and determ…
Wide, Cool and Ultracool Companions to Nearby Stars from Pan-STARRS1
Niall R. Deacon, Michael C. Liu, Eugene A. Magnier +18
We present the discovery of 61 wide (>5 arcsecond) separation, low-mass (stellar and substellar) companions to stars in the solar neighborhood identified from Pan-STARRS\,1 (PS1) d…
Properties of M31. IV: Candidate Luminous Blue Variables from PAndromeda
C. -H. Lee, S. Seitz, M. Kodric +16
We perform a study on the optical and infrared photometric properties of known luminous blue variables (LBVs) in M31 using the sample of LBV candidates from the Local Group Galaxy…
Characterization of the Praesepe Star Cluster by Photometry and Proper Motions with 2MASS, PPMXL, and Pan-STARRS
P. F. Wang, W. P. Chen, C. C. Lin +31
Membership identification is the first step to determine the properties of a star cluster. Low-mass members in particular could be used to trace the dynamical history, such as mass…
Detection of an outburst one year prior to the explosion of SN 2011ht
M. Fraser, M. Magee, R. Kotak +18
Using imaging from the Pan-STARRS1 survey, we identify a precursor outburst at epochs 287 and 170 days prior to the reported explosion of the purported Type IIn supernova (SN) 2011…
A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE: Discovery of Seven Nearby Objects Including Two Candidate Spectroscopic Variables
William M. J. Best, Michael C. Liu, Eugene A. Magnier +13
We present initial results from a wide-field (30,000 deg^2) search for L/T transition brown dwarfs within 25 pc using the Pan-STARRS1 and WISE surveys. Previous large-area searches…
A Pan-STARRS + UKIDSS Search for Young, Wide Planetary-Mass Companions in Upper Scorpius
Kimberly M. Aller, Adam L. Kraus, Michael C. Liu +6
We have combined optical and NIR photometry from Pan-STARRS 1 and UKIDSS to search the young (5-10 Myr) star-forming region of Upper Scorpius for wide (~400-4000 AU) substellar com…
LHS 2803B: A very wide mid-T dwarf companion to an old M dwarf identified from Pan-STARRS1
Niall R. Deacon, Michael C. Liu, Eugene A. Magnier +12
We report the discovery of a wide (approximately 400 AU projected separation), common proper motion companion to the nearby M dwarf LHS 2803 (PSO J207.0300-13.7422). This object wa…
Four new T dwarfs identified in PanSTARRS 1 commissioning data
Niall R. Deacon, Michael C. Liu, Eugene A. Magnier +14
A complete well-defined sample of ultracool dwarfs is one of the key science programs of the Pan-STARRS 1 optical survey telescope (PS1). Here we combine PS1 commissioning data wit…
A Search for High Proper Motion T Dwarfs with Pan-STARRS1 + 2MASS + WISE
Michael C. Liu, Niall R. Deacon, Eugene A. Magnier +13
We have searched ~8200 sq. degs for high proper motion (~0.5-2.7"/year) T dwarfs by combining first-epoch data from the Pan-STARRS1 (PS1) 3-Pi Survey, the 2MASS All-Sky Point Sourc…
Ultra-bright optical transients are linked with type Ic supernovae
A. Pastorello, S. J. Smartt, M. T. Botticella +41
Recent searches by unbiased, wide-field surveys have uncovered a group of extremely luminous optical transients. The initial discoveries of SN 2005ap by the Texas Supernova Search…
Displaying the Heterogeneity of the SN 2002cx-like Subclass of Type Ia Supernovae with Observations of the Pan-STARRS-1 Discovered SN2009ku
G. Narayan, R. J. Foley, E. Berger +22
SN2009ku, discovered by Pan-STARRS-1, is a Type Ia supernova (SNIa), and a member of the distinct SN2002cx-like class of SNeIa. Its light curves are similar to the prototypical SN2…