Search Publications
Thermal structure of the Venusian atmosphere from the sub-cloud region to the mesosphere as observed by radio occultation
Tellmann, Silvia; Pätzold, Martin; Imamura, Takeshi +9 more
We present distributions of the zonal-mean temperature and static stability in the Venusian atmosphere obtained from Venus Express and Akatsuki radio occultation profiles penetrating down to an altitude of 40 km. At latitudes equatorward of 75°, static stability derived from the observed temperature profiles is consistent with previous in-situ mea…
Scattering-induced Intensity Reduction: Large Mass Content with Small Grains in the Inner Region of the TW Hya disk
Kataoka, Akimasa; Tsukagoshi, Takashi; Ueda, Takahiro
Dust continuum observation is one of the best methods to constrain the properties of protoplanetary disks. Recent theoretical studies have suggested that dust scattering at the millimeter wavelength potentially reduces the observed intensity, which results in an underestimate in the dust mass. We investigate whether dust scattering indeed reduces …
Presupernova Neutrinos: Directional Sensitivity and Prospects for Progenitor Identification
Timmes, F. X.; Mukhopadhyay, Mainak; Lunardini, Cecilia +1 more
We explore the potential of current and future liquid scintillator neutrino detectors of ${ \mathcal O }(10)$ kt mass to localize a presupernova neutrino signal in the sky. In the hours preceding the core collapse of a nearby star (at distance $D\lesssim 1$ kpc), tens to hundreds of inverse beta decay events will be recorded, and their reconstruct…
Spectroscopically Confirmed Lyα Emitters from Redshift 5 to 7 behind 10 Galaxy Cluster Lenses
Hoag, A.; Bradač, M.; Treu, T. +10 more
We present 36 spectroscopically confirmed intrinsically UV-faint Lyα-emitting galaxies from follow-up observations with Keck/DEep Imaging Multi-Object Spectrograph of gravitationally lensed high-redshift candidates. Candidates were selected to be between 5 ≲ z ≲ 7 from photometric data using Hubble Space Telescope and Spitzer imaging surveys. We p…
Understanding the origins of the heliosphere: integrating observations and measurements from Parker Solar Probe, Solar Orbiter, and other space- and ground-based observatories
Williams, D.; Solanki, S. K.; Müller, D. +28 more
Context. The launch of Parker Solar Probe (PSP) in 2018, followed by Solar Orbiter (SO) in February 2020, has opened a new window in the exploration of solar magnetic activity and the origin of the heliosphere. These missions, together with other space observatories dedicated to solar observations, such as the Solar Dynamics Observatory, Hinode, I…
Dust and gas content of high-redshift galaxies hosting obscured AGN in the Chandra Deep Field-South
Pozzi, F.; Feltre, A.; Fritz, J. +14 more
Context. Obscured active galactic nuclei (AGN) represent a significant fraction of the entire AGN population, especially at high redshift (∼70% at z = 3 - 5). They are often characterized by the presence of large gas and dust reservoirs that are thought to sustain and possibly obscure vigorous star formation processes that make these objects shine…
OpenMARS: A global record of martian weather from 1999 to 2015
Holmes, James A.; Lewis, Stephen R.; Patel, Manish R.
The Open access to Mars Assimilated Remote Soundings (OpenMARS) dataset is a reanalysis product combining past spacecraft observations with a Mars Global Circulation Model (GCM). The OpenMARS product is a global surface/atmosphere reference database of surface and atmospheric properties for almost nine Mars years that can be used by Mars scientist…
Hot Plasma Flows and Oscillations in the Loop-top Region During the 2017 September 10 X8.2 Solar Flare
Reeves, Katharine K.; Polito, Vanessa; Chen, Bin +4 more
In this study, we investigate motions in the hot plasma above the flare loops during the 2017 September 10 X8.2 flare event. We examine the region to the south of the main flare arcade, where there is data from the Interface Region Imaging Spectrograph (IRIS) and the Extreme ultraviolet Imaging Spectrometer (EIS) on Hinode. We find that there are …
OB Associations and their origins
Wright, Nicholas J.
OB associations are unbound groups of young stars made prominent by their bright OB members, and have long been thought to be the expanded remnants of dense star clusters. They have been important in astrophysics for over a century thanks to their luminous massive stars, though their low-mass members have not been well studied until the last coupl…
Sign of Hard-X-Ray Pulsation from the γ -Ray Binary System LS 5039
Takahashi, T.; Enoto, T.; Makishima, K. +3 more
To understand the nature of the brightest γ -ray binary system LS 5039, hard x-ray data of the object, taken with the Suzaku and NuSTAR observatories in 2007 and 2016, respectively, were analyzed. The two data sets jointly gave tentative evidence for a hard x-ray periodicity, with a period of ∼9 s and a period increase rate by ∼3 ×10-10…