G. Simonian
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View article: Final Targeting Strategy for the Sloan Digital Sky Survey IV Apache Point Observatory Galactic Evolution Experiment 2 North Survey
Final Targeting Strategy for the Sloan Digital Sky Survey IV Apache Point Observatory Galactic Evolution Experiment 2 North Survey Open
The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is a dual-hemisphere, near-infrared (NIR), spectroscopic survey with the goal of producing a chemodynamical mapping of the Milky Way. The targeting for APOGEE-2 is com…
View article: Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey
Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey Open
APOGEE-2 is a dual-hemisphere, near-infrared (NIR), spectroscopic survey with the goal of producing a chemo-dynamical mapping of the Milky Way Galaxy. The targeting for APOGEE-2 is complex and has evolved with time. In this paper, we prese…
View article: Surface Rotation and Photometric Activity for <i>Kepler</i> Targets. I. M and K Main-sequence Stars
Surface Rotation and Photometric Activity for <i>Kepler</i> Targets. I. M and K Main-sequence Stars Open
Brightness variations due to dark spots on the stellar surface encode\ninformation about stellar surface rotation and magnetic activity. In this work,\nwe analyze the Kepler long-cadence data of 26,521 main-sequence stars of\nspectral type…
View article: Rapid Rotation in the Kepler Field: Not a Single Star Phenomenon
Rapid Rotation in the Kepler Field: Not a Single Star Phenomenon Open
Tens of thousands of rotation periods have been measured in the Kepler fields, including a substantial fraction of rapid rotators. We use Gaia parallaxes to distinguish photometric binaries (PBs; from single stars on the unevolved lower ma…
View article: Surface Rotation Of Kepler Solar-Type Stars
Surface Rotation Of Kepler Solar-Type Stars Open
Dark spots crossing the stellar disk lead to periodic modulations in stellar light-curves that encode information on surface rotation and magnetic activity. Here, we analyze Kepler long-cadence data (four different time-series) for ~50,000…
View article: 2FGL J0846.0+2820 opt. counterpart follow-up
2FGL J0846.0+2820 opt. counterpart follow-up Open
The γ-ray source was first detected as 2FGL J0846.0+2820 (Nolan+ 2012, J/ApJS/199/31), listed in the second full catalog of Fermi-LAT sources, based on the first two years of LAT data obtained from 2008 August to 2010 August using the earl…
View article: Reverberation Mapping of Optical Emission Lines in Five Active Galaxies
Reverberation Mapping of Optical Emission Lines in Five Active Galaxies Open
We present the first results from an optical reverberation mapping campaign executed in 2014 targeting the active galactic nuclei (AGNs) MCG+08-11-011, NGC 2617, NGC 4051, 3C 382, and Mrk 374. Our targets have diverse and interesting obser…
View article: The ASAS-SN Bright Supernova Catalog – II. 2015
The ASAS-SN Bright Supernova Catalog – II. 2015 Open
This manuscript presents information for all supernovae discovered by the\nAll-Sky Automated Survey for SuperNovae (ASAS-SN) during 2015, its second full\nyear of operations. The same information is presented for bright ($m_V\\leq17$),\nsp…
View article: Circumstellar dust, PAHs and stellar populations in early-type galaxies: insights from<i>GALEX</i>and<i>WISE</i>
Circumstellar dust, PAHs and stellar populations in early-type galaxies: insights from<i>GALEX</i>and<i>WISE</i> Open
A majority of early-type galaxies contain interstellar dust, yet the origin\nof this dust, and why the dust sometimes exhibits unusual polycyclic aromatic\nhydrocarbon (PAH) ratios, remains a mystery. If the dust is internally\nproduced, i…
View article: The ASAS-SN bright supernova catalogue – I. 2013–2014
The ASAS-SN bright supernova catalogue – I. 2013–2014 Open
We present basic statistics for all supernovae discovered by the All-Sky\nAutomated Survey for SuperNovae (ASAS-SN) during its first year-and-a-half of\noperations, spanning 2013 and 2014. We also present the same information for\nall othe…
View article: THE YOUNG AND BRIGHT TYPE IA SUPERNOVA ASASSN-14lp: DISCOVERY, EARLY-TIME OBSERVATIONS, FIRST-LIGHT TIME, DISTANCE TO NGC 4666, AND PROGENITOR CONSTRAINTS
THE YOUNG AND BRIGHT TYPE IA SUPERNOVA ASASSN-14lp: DISCOVERY, EARLY-TIME OBSERVATIONS, FIRST-LIGHT TIME, DISTANCE TO NGC 4666, AND PROGENITOR CONSTRAINTS Open
On 2014 December 9.61, the All-sky Automated Survey for SuperNovae (ASAS-SN or “Assassin”) discovered ASASSN-14lp just ∼2 days after first light using a global array of 14 cm diameter telescopes. ASASSN-14lp went on to become a bright supe…
View article: ASASSN-15lh: A highly super-luminous supernova
ASASSN-15lh: A highly super-luminous supernova Open
The most luminous supernova to date Supernovae are exploding stars at the end of their lives, providing an input of heavy elements and energy into galaxies. Some types have near-identical peak brightness, but in recent years a new class of…
View article: Six months of multiwavelength follow-up of the tidal disruption candidate ASASSN-14li and implied TDE rates from ASAS-SN
Six months of multiwavelength follow-up of the tidal disruption candidate ASASSN-14li and implied TDE rates from ASAS-SN Open
We present ground-based and Swift photometric and spectroscopic observations of the candidate tidal disruption event (TDE) ASASSN-14li, found at the center of PGC043234 (d ' 90 Mpc) by the All-Sky Automated Survey for SuperNovae (ASAS-SN).…
View article: Massive stars exploding in a He-rich circumstellar medium – VII. The metamorphosis of ASASSN-15ed from a narrow line Type Ibn to a normal Type Ib Supernova
Massive stars exploding in a He-rich circumstellar medium – VII. The metamorphosis of ASASSN-15ed from a narrow line Type Ibn to a normal Type Ib Supernova Open
In this paper, we present the results of the spectroscopic and photometric monitoring campaign of ASASSN-15ed. The transient was discovered quite young by the All Sky Automated Survey for SuperNovae (ASAS-SN) survey. Amateur astronomers al…
View article: Total eclipse of the heart: the AM CVn Gaia14aae/ASSASN-14cn
Total eclipse of the heart: the AM CVn Gaia14aae/ASSASN-14cn Open
We report the discovery and characterization of a deeply eclipsingAMCVn-system, Gaia14aae (=ASSASN-14cn). Gaia14aae was identified independently by the All-Sky Automated Survey for Supernovae (ASAS-SN; Shappee et al.) and by the Gaia Scien…