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TESS Discovery of Twin Planets near 2:1 Resonance around Early M Dwarf TOI 4342
Vanderburg, Andrew; Lester, Kathryn V.; Latham, David W. +28 more
With data from the Transiting Exoplanet Survey Satellite (TESS), we showcase improvements to the MIT Quick Look Pipeline (QLP) through the discovery and validation of a multiplanet system around M dwarf TOI 4342 (T mag = 11.032, M ⋆ = 0.63 M ⊙, R ⋆ = 0.60 R ⊙, T eff = 3900 K, d = 61…
Estimating Coronal Mass Ejection Mass and Kinetic Energy by Fusion of Multiple Deep-learning Models
Wang, Haimin; Yurchyshyn, Vasyl; Li, Jialiang +5 more
Coronal mass ejections (CMEs) are massive solar eruptions, which have a significant impact on Earth. In this paper, we propose a new method, called DeepCME, to estimate two properties of CMEs, namely, CME mass and kinetic energy. Being able to estimate these properties helps better understand CME dynamics. Our study is based on the CME catalog mai…
Climatological Gravity Waves in the Middle and Upper Atmosphere of Mars Based on ACS/TGO Observations
Zhang, Yun; Zhang, Jie; Ji, Qianqian +2 more
Gravity waves (GWs) are important for the vertical coupling of the Martian atmosphere. The middle atmosphere is the key region where GWs propagate to the upper thermosphere and generate momentum and energy exchange, but the knowledge of middle-atmosphere GWs is incomplete, due to the lack of observations with the kilometer-scale resolution. We hav…
Indirect Observations of Electric Fields at Comet 67P
Gunell, H.; Nilsson, H.; Goetz, C. +2 more
No spacecraft visiting a comet has been equipped with instruments to directly measure the static electric field. However, the electric field can occasionally be estimated indirectly by observing its effects on the ion velocity distribution. We present such observations made by the Rosetta spacecraft on 19 April 2016, 35 km from the nucleus. At thi…
Solar Energetic Particle Events Detected in the Housekeeping Data of the European Space Agency's Spacecraft Flotilla in the Solar System
Wimmer-Schweingruber, Robert F.; Wood, Simon; Wilson, Colin +37 more
Despite the growing importance of planetary Space Weather forecasting and radiation protection for science and robotic exploration and the need for accurate Space Weather monitoring and predictions, only a limited number of spacecraft have dedicated instrumentation for this purpose. However, every spacecraft (planetary or astronomical) has hundred…
The Radiation Environments of Middle-aged F-type Stars
France, K.; Hinton, P. C.; Fleming, B. +5 more
Far-ultraviolet (FUV) emission lines from dwarf stars are important driving sources of photochemistry in planetary atmospheres. Properly interpreting spectral features of planetary atmospheres critically depends on the emission of its host star. While the spectral energy distributions (SEDs) of K- and M-type stars have been extensively characteriz…
Accretion Disk Wind of Hercules X-1 during the Short High State
Fabian, A. C.; Pinto, C.; Kara, E. +5 more
Hercules X-1 is a nearly edge-on X-ray binary with a warped, precessing accretion disk, which manifests through a 35-day cycle of alternating High and Low flux states. This disk precession introduces a changing line of sight toward the X-ray source, through an ionized accretion disk wind. The sightline variation allows us to uniquely determine how…
CHIMERA Occultation Constraints on the Abundance of Kilometer-scale Kuiper Belt Objects
Zhang, Qicheng; Saini, Navtej S.; Hallinan, Gregg W. +3 more
Occultations provide indirect sensitivity to the number density of small Kuiper Belt objects (KBOs) too faint to directly detect telescopically. We present results from the Caltech HI-speed Multicolor camERA (CHIMERA) survey with the Palomar Hale Telescope, which monitored stars over the central $5^{\prime} \times 5^{\prime} $ of the M22 globular …
RR Lyrae Stars in the Globular Cluster Palomar 2
Arellano Ferro, A.; Muneer, S.; Bustos Fierro, I. +1 more
A CCD VI imaging time-series over 11-year is employed to explore the light curves of stars in the field of Palomar 2. We discovered 20 RRab and 1 RRc variables. A revision of Gaia-DR3 data enabled us to identify 10 more variables and confirm the RRab nature of 6 of them and one RGB. The cluster membership is discussed, and 18 variables are most li…
Tidal disruption events and quasi‑periodic eruptions
Lin, Dacheng; Godet, Olivier; Webb, Natalie A. +4 more
Tidal disruption events (TDEs) occur when a star passes close to a massive black hole so that the tidal forces of the black hole exceed the binding energy of a star and cause it to be ripped apart. Part of the matter will fall onto the black hole, causing a strong increase in luminosity. Such events are often seen in the optical or the x‑ray (or b…