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Direct Imaging of Exoplanets beyond the Radial Velocity Limit: Application to the HD 134987 System
Gonzalez-Quiles, Junellie; Kane, Stephen R.; Girard, Julien H. +4 more
Future direct imaging missions will primarily observe planets that have been previously detected, mostly via the radial velocity (RV) technique, to characterize planetary atmospheres. In the meantime, direct imaging may discover new planets within existing planetary systems that have bright enough reflected flux but insufficient signals for other …
Ion bulk speeds and temperatures in the diamagnetic cavity of comet 67P from RPC-ICA measurements
Nilsson, Hans; Stenberg Wieser, Gabriella; Wieser, Martin +6 more
Comets are constantly interacting with the solar wind. When the comet activity is high enough, this leads to the creation of a magnetic field free region around the nucleus known as the diamagnetic cavity. It has been suggested that the ion-neutral drag force is balancing the magnetic pressure at the cavity boundary, but after the visit of Rosetta…
Proper motion measurements for stars up to 100 kpc with Subaru HSC and SDSS Stripe 82
Wang, Wenting; Komiyama, Yutaka; Takada, Masahiro +6 more
We present proper motion measurements for more than 0.55 million main-sequence stars, by comparing astrometric positions of matched stars between the multiband imaging data sets from the Hyper Suprime-Cam (HSC) Survey and the Sloan Digital Sky Survey (SDSS) Stripe 82. In doing this, we use 3 million galaxies to recalibrate the astrometry and set u…
Automated Detection of Accelerating Solar Eruptions Using Parabolic Hough Transform
West, Matthew J.; Mierla, Marilena; Pant, Vaibhav +3 more
Solar eruptions such as coronal mass ejections (CMEs) observed in the inner solar corona (up to 4 R⊙) show acceleration profiles that appear as parabolic ridges in height-time plots. Inspired by the white-light automated detection algorithms Computer Aided CME Tracking System (CACTus) and Solar Eruptive Events Detection System (SEEDS), …
Concordance: In-flight Calibration of X-Ray Telescopes without Absolute References
Drake, Jeremy J.; Guainazzi, Matteo; van Dyk, David A. +7 more
We describe a process for cross-calibrating the effective areas of X-ray telescopes that observe common targets. The targets are not assumed to be "standard candles" in the classic sense, in that we assume that the source fluxes have well-defined, but a priori unknown values. Using a technique developed by Chen et al. that involves a statistical m…
Stormtime energetics: Energy transport across the magnetopause in a global MHD simulation
Pulkkinen, Tuija I.; Toth, Gabor; Al Shidi, Qusai +1 more
Coupling between the solar wind and magnetosphere can be expressed in terms of energy transfer through the separating boundary known as the magnetopause. Geospace simulation is performed using the Space Weather Modeling Framework (SWMF) of a multi-ICME impact event on February 18-20, 2014 in order to study the energy transfer through the magnetopa…
The Magnetic Environment of a Stealth Coronal Mass Ejection
Long, David M.; Démoulin, Pascal; Green, Lucie M. +4 more
Interest in stealth coronal mass ejections (CMEs) is increasing due to their relatively high occurrence rate and space weather impact. However, typical CME signatures such as extreme-ultraviolet dimmings and post-eruptive arcades are hard to identify and require extensive image processing techniques. These weak observational signatures mean that l…
Photometric redshifts in the North Ecliptic Pole Wide field based on a deep optical survey with Hyper Suprime-Cam
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +13 more
The AKARI space infrared telescope has performed near-infrared to mid-infrared (MIR) observations on the North Ecliptic Pole Wide (NEPW) field (5.4 deg2) for about 1 yr. AKARI took advantage of its continuous nine photometric bands, compared with NASA's Spitzer and Wide-field Infrared Survey Explorer(WISE) space telescopes, which had on…
Investigating width distribution of slow and fast CMEs in solar cycles 23 and 24
Banerjee, D.; Gopalswamy, N.; Patel, R. +3 more
Coronal Mass Ejections (CMEs) are highly dynamic events originating in the solar atmosphere, that show a wide range of kinematic properties and are the major drivers of the space weather. The angular width of the CMEs is a crucial parameter in the study of their kinematics. The fact that whether slow and fast CMEs (as based on their relative speed…
The IBISCO survey. I. Multiphase discs and winds in the Seyfert galaxy Markarian 509
Fiore, F.; Piconcelli, E.; Dadina, M. +9 more
We present the analysis of the ALMA CO(2−1) emission line and the underlying 1.2 mm continuum of Mrk 509 with spatial resolution of ∼270 pc. This local Seyfert 1.5 galaxy, optically classified as a spheroid, is known to host an ionised disc, a starburst ring, and ionised gas winds on both nuclear (ultra-fast outflows) and galactic scales. From CO(…