Search Publications
Missions
Journals
Publication Years
An Enhancement of Jupiter's Main Auroral Emission and Magnetospheric Currents
Wilson, R. J.; Kurth, W. S.; Bagenal, F. +9 more
We present observations of Jupiter's magnetic field and plasma obtained with the NASA Juno spacecraft during February 2018, along with simultaneous Hubble Space Telescope (HST) observations of the planet's auroras. We show that a few-day transient enhancement of the azimuthal and radial magnetic fields and plasma temperature was coincident with a …
Obliquity measurement and atmospheric characterisation of the WASP-74 planetary system
Tamura, M.; Pallé, E.; Béjar, V. J. S. +27 more
We present new transit observations of the hot Jupiter WASP-74 b (Teq ~ 1860 K) using the high-resolution spectrograph HARPS-N and the multi-colour simultaneous imager MuSCAT2. We refined the orbital properties of the planet and its host star and measured its obliquity for the first time. The measured sky-projected angle between the ste…
A new and unusual LBV-like outburst from a Wolf-Rayet star in the outskirts of M33
Filippenko, Alexei V.; Kilpatrick, Charles D.; Smith, Nathan +8 more
MCA-1B (also called UIT003) is a luminous hot star in the western outskirts of M33, classified over 20 yr ago with a spectral type of Ofpe/WN9 and identified then as a candidate luminous blue variable (LBV). Palomar Transient Factory data reveal that this star brightened in 2010, with a light curve resembling that of the classic LBV star AF And in…
Asteroid mass estimation with the robust adaptive Metropolis algorithm
Granvik, M.; Siltala, L.
Context. The bulk density of an asteroid informs us about its interior structure and composition. To constrain the bulk density, one needs an estimated mass of the asteroid. The mass is estimated by analyzing an asteroid's gravitational interaction with another object, such as another asteroid during a close encounter. An estimate for the mass has…
The (Re)appearance of NGC 925 ULX-3, a New Transient ULX
Fürst, Felix; Middleton, Matthew J.; Roberts, Timothy P. +8 more
We report the discovery of a third ULX in NGC 925 (ULX-3), detected in 2017 November by Chandra at a luminosity of LX = (7.8 ± 0.8) × 1039 erg s-1. Examination of archival data for NGC 925 reveals that ULX-3 was detected by Swift at a similarly high luminosity in 2011, as well as by XMM-Newton in 2017 January at a …
Annual parallax measurement of the Mira variable star BX Camelopardalis with VERA
Kurayama, Tomoharu; Honma, Mareki; Nakagawa, Akiharu +8 more
We report the results of astrometric VLBI observations toward the Mira variable star BX Cam using the VERA VLBI array. The observation was performed from 2012 February to 2014 November. The parallax obtained is 1.73 ± 0.03 mas corresponding to a distance of 0.58 ± 0.01 kpc. The parallax of this source was reported in Gaia DR2 as 4.13 ± 0.25 mas, a…
Bi-abundance photoionization models of planetary nebulae: determining the amount of oxygen in the metal-rich component
Morisset, C.; Gómez-Llanos, V.
We study the hypothesis of high-metallicity clumps being responsible for the abundance discrepancy found in planetary nebulae between the values obtained from recombination and collisionally excited lines. We generate grids of photoionization models combining cold metal-rich clumps emitting the heavy element recombination lines, embedded in a norm…
Visible and near-infrared observations of interstellar comet 2I/Borisov with the 10.4-m GTC and the 3.6-m TNG telescopes
Geier, S.; Lara, L. M.; Moreno, F. +15 more
In this work, we present the results of an observational study of 2I/Borisov carried out with the 10.4-m Gran Telescopio Canarias (GTC) and the 3.6-m Telescopio Nazionale Galileo (TNG), both telescopes located at the Roque de Los Muchachos Observatory, in the island of La Palma (Spain). The study includes images in the visible and near-infrared, a…
In Search for a Planet Better than Earth: Top Contenders for a Superhabitable World
Heller, René; Guinan, Edward; Schulze-Makuch, Dirk
The fact that Earth is teeming with life makes it appear odd to ask whether there could be other planets in our galaxy that may be even more suitable for life. Neglecting this possible class of "superhabitable" planets, however, could be considered anthropocentric and geocentric biases. Most important from the perspective of an observer searching …
Informing dark matter direct detection limits with the ARTEMIS simulations
McCarthy, Ian G.; Font, Andreea S.; Poole-McKenzie, Robert +4 more
Dark matter (DM) direct detection experiments aim to place constraints on the DM-nucleon scattering cross-section and the DM particle mass. These constraints depend sensitively on the assumed local DM density and velocity distribution function. While astrophysical observations can inform the former (in a model-dependent way), the latter is not dir…