J. Tristram

J. Tristram
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J. Tristram
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Earth and Planetary Astrophysics (4)
 
Solar and Stellar Astrophysics (2)
 
Astrophysics of Galaxies (1)
 
High Energy Astrophysical Phenomena (1)

Publications Authored By J. Tristram

It has recently been discovered that some, if not all, classical novae emit GeV gamma-rays during outburst, but the mechanics of this gamma-ray emission are still not well understood. We present here a comprehensive, multi-wavelength dataset---from radio to X-rays---for the most gamma-ray luminous classical nova to-date, V1324 Sco. Using this dataset, we show that V1324 Sco is a canonical dusty Fe-II type nova, with a bulk ejecta velocity of $1150 \pm 40~\rm km~s^{-1}$ and an ejecta mass of $2. Read More

2015Nov
Affiliations: 1The MOA Collaboration, 2The MOA Collaboration, 3The MOA Collaboration, 4The MOA Collaboration, 5The MOA Collaboration, 6The MOA Collaboration, 7The MOA Collaboration, 8The MOA Collaboration, 9The MOA Collaboration, 10The MOA Collaboration, 11The MOA Collaboration, 12The MOA Collaboration, 13The MOA Collaboration, 14The MOA Collaboration, 15The MOA Collaboration, 16The MOA Collaboration, 17The MOA Collaboration, 18The MOA Collaboration, 19The MOA Collaboration, 20The MOA Collaboration, 21The MOA Collaboration, 22The MOA Collaboration, 23The MOA Collaboration, 24The MOA Collaboration, 25The MOA Collaboration, 26The MOA Collaboration, 27The MOA Collaboration, 28The MOA Collaboration, 29The MOA Collaboration, 30The MOA Collaboration, 31The MOA Collaboration, 32The MOA Collaboration, 33The MOA Collaboration, 34The MOA Collaboration, 35The MOA Collaboration, 36The MOA Collaboration, 37The MOA Collaboration

We present the discovery of the first Neptune analog exoplanet or super-Earth with Neptune-like orbit, MOA-2013-BLG-605Lb. This planet has a mass similar to that of Neptune or a super-Earth and it orbits at $9\sim 14$ times the expected position of the snow-line, $a_{\rm snow}$, which is similar to Neptune's separation of $ 11\,a_{\rm snow}$ from the Sun. The planet/host-star mass ratio is $q=(3. Read More

For all exoplanet candidates, the reliability of a claimed detection needs to be assessed through a careful study of systematic errors in the data to minimize the false positives rate. We present a method to investigate such systematics in microlensing datasets using the microlensing event OGLE-2013-BLG-0446 as a case study. The event was observed from multiple sites around the world and its high magnification (A_{max} \sim 3000) allowed us to investigate the effects of terrestrial and annual parallax. Read More

2015Aug

We report the detection of a Cold Neptune m_planet=21+/-2MEarth orbiting a 0.38MSol M dwarf lying 2.5-3. Read More

We present measurements of the microlensing optical depth and event rate toward the Galactic Bulge based on two years of the MOA-II survey. This sample contains ~1000 microlensing events, with an Einstein Radius crossing time of t_E < 200 days between -5 Read More

We report the result of the analysis of the light curve of the microlensing event MOA-2009-BLG-016. The light curve is characterized by a short-duration anomaly near the peak and an overall asymmetry. We find that the peak anomaly is due to a binary companion to the primary lens and the asymmetry of the light curve is explained by the parallax effect caused by the acceleration of the observer over the course of the event due to the orbital motion of the Earth around the Sun. Read More