Search Publications
Shortest Microlensing Event with a Bound Planet: KMT-2016-BLG-2605
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +17 more
With a planet-host mass ratio q = 0.012 ± 0.001, KMT-2016-BLG-2605 has the shortest Einstein timescale, tE = 3.41 ± 0.13 days, of any planetary microlensing event to date. This prompts us to examine the full sample of seven short (tE < 7 days) planetary events with good q measurements. We find that six have clustered Einst…
Fragmenting Active Asteroid 331P/Gibbs
Jewitt, David; Li, Jing; Kim, Yoonyoung
We describe active asteroid 331P/Gibbs (2012 F5) using archival Hubble Space Telescope (HST) data taken between 2015 and 2018. 331P is an outer main belt active asteroid with a long-lived debris trail that formed in 2011. Embedded in the debris trail we identify 19 fragments with radii between 0.04 and 0.11 km (albedo 0.05 assumed) containing abou…
Multipoint remote and in situ observations of interplanetary coronal mass ejection structures during 2011 and associated geomagnetic storms
Teriaca, Luca; Srivastava, Nandita; Mishra, Wageesh +1 more
We present multipoint remote and in situ observations of interplanetary coronal mass ejection (ICME) structures during the year 2011. The selected ICMEs arrived at Earth on 2011 March 11 and 2011 August 6, and led to geomagnetic storms. Around the launch of these CMEs from the Sun, the coronagraphs onboard STEREO-Aand-B and SOHO enabled the CMEs t…
New Measurement of the Vertical Atmospheric Density Profile From Occultations of the Crab Nebula With X Ray Astronomy Satellites Suzaku and Hitomi
Katsuda, Satoru; Sato, Kosuke; Tashiro, Makoto S. +6 more
We present new measurements of the vertical density profile of the Earth's atmosphere at altitudes between 70 and 200 km, based on Earth occultations of the Crab Nebula observed with the X ray Imaging Spectrometer onboard Suzaku and the hard X ray Imager onboard Hitomi. X ray spectral variation due to the atmospheric absorption is used to derive t…
Cassini Observation of Relativistic Electron Butterfly Distributions in Saturn's Inner Radiation Belts: Evidence for Acceleration by Local Processes
Krupp, N.; Wei, Y.; Roussos, E. +3 more
The morphology of electron pitch angle distributions (PADs) helps to identify dynamic processes in Saturn's magnetosphere. Previous studies demonstrated convective transport being important for relativistic electron acceleration at L > 4 in the inner magnetosphere, whereas closer to Saturn the situation is not as well established. We have inves…
Clean catalogues of blue horizontal-branch stars using Gaia EDR3
Geier, S.; Pelisoli, I.; Culpan, R.
Context. Blue horizontal-branch stars evolve from low-mass stars that have completed their main-sequence lifetimes and undergone a helium flash at the end of their red-giant phase. As such, blue horizontal-branch stars are very old objects that can be used as markers in studies of the Galactic structure and formation history. To create a clean sky…
EMISSA (Exploring Millimeter Indicators of Solar-Stellar Activity). I. The initial millimeter-centimeter main-sequence star sample
Mohan, A.; Hauschildt, P. H.; Wedemeyer, S. +2 more
Context. Due to their wide wavelength coverage across the millimeter to centimeter (mm-cm) range and their increased sensitivity, modern interferometric arrays facilitate observations of the thermal and non-thermal radiation that is emitted from different layers in the outer atmospheres of stars.
Aims: We study the spectral energy distributio…
Chandra, NuSTAR, and Optical Observations of the Cataclysmic Variables IGR J17528-2022 and IGR J20063+3641
Mori, Kaya; Thorstensen, John R.; Halpern, Jules P. +5 more
We report on Chandra, NuSTAR, and MDM observations of two International Gamma-ray Astrophysics Laboratory (INTEGRAL) sources, namely IGR J17528-2022 and IGR J20063+3641. IGR J17528-2022 is an unidentified INTEGRAL source, while IGR J20063+3641 was recently identified as a magnetic cataclysmic variable (mCV) by Halpern et al. The Chandra observatio…
The OTELO survey as a morphological probe. Last ten Gyr of galaxy evolution. The mass-size relation up to z = 2
Gallego, Jesús; Sánchez-Portal, Miguel; Pintos-Castro, Irene +14 more
Context. The morphology of galaxies provide us with a unique tool for relating and understanding other physical properties and their changes over the course of cosmic time. It is only recently that we have been afforded access to a wealth of data for an unprecedented number galaxies thanks to large and deep surveys.
Aims: We present the morph…
A Giant Loop of Ionized Gas Emerging from the Tumultuous Central Region of IC 5063
Ho, Luis C.; Elvis, Martin; Fischer, Travis C. +6 more
The biconical radiation pattern extending from an active galactic nucleus (AGN) may strongly photoionize the circumnuclear interstellar medium (ISM) and stimulate emission from the narrow-line region (NLR). Observations of the NLR may provide clues to the structure of dense material that preferentially obscures the bicone at certain angles, and ma…