David Polishook
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View article: A Search for Minute-timescale Flares from the Transient AT 2024wpp
A Search for Minute-timescale Flares from the Transient AT 2024wpp Open
The AT 2018cow-like fast blue optical transient AT 2022tsd showed a large number of a few-minute-duration, high-luminosity (∼10 43 erg s −1 ) flares. We present an intensive search for such flares from another 18cow-like event, AT 2024wpp.…
View article: The Massalia asteroid family as the origin of ordinary L chondrites
The Massalia asteroid family as the origin of ordinary L chondrites Open
Studies of micrometeorites in mid-Ordovician limestones and Earth’s impact craters indicate that our planet witnessed a massive infall of ordinary L chondrite material ~466 million years (My) ago (Heck et al. 2017, Schmieder & Kr…
View article: Comet C/2012 S1 (ISON) crossing the Jupiter orbit
Comet C/2012 S1 (ISON) crossing the Jupiter orbit Open
We report results of intensive time-resolved imaging photometry and synoptic deep imaging of the comet C/2012 S1 (ISON) performed in February 2013. The data were obtained at the Wise Observatory in Israel (WO), at the Himalayan Chandra Tel…
View article: HighSpec: high-resolution spectrograph for the MAST telescope array
HighSpec: high-resolution spectrograph for the MAST telescope array Open
We present the updated design of HighSpec, a high-resolution $\mathcal{R} \sim 20,000$ spectrograph designed for the Multi Aperture Spectroscopic Telescope (MAST). HighSpec offers three observing modes centered at the Ca II H&K, Mg b tripl…
View article: Candidate Main-belt Asteroids for Surface Heterogeneity
Candidate Main-belt Asteroids for Surface Heterogeneity Open
Large terrestrial bodies in our solar system like the Earth, Mars, Mercury, and the Moon exhibit geologically complex surfaces with compositional heterogeneity. From past studies using large telescopes and spacecraft, it was shown that ast…
View article: Asteroid Collisions: Expected Visibility and Rate
Asteroid Collisions: Expected Visibility and Rate Open
Asteroid collisions are one of the main processes responsible for the evolution of bodies in the main belt. Using observations of the Dimorphos impact by the DART spacecraft, we estimate how asteroid collisions in the main belt may look in…
View article: The Massalia asteroid family as the origin of ordinary L chondrites
The Massalia asteroid family as the origin of ordinary L chondrites Open
Studies of micrometeorites in mid-Ordovician limestones and Earth's impact craters indicate that our planet witnessed a massive infall of ordinary L chondrite material 466 million years (My) ago (Heck et al. 2017, Schmieder & Kring 2020, K…
View article: Asteroid collisions: expected visibility and rate
Asteroid collisions: expected visibility and rate Open
Asteroid collisions are one of the main processes responsible for the evolution of bodies in the main belt. Using observations of the Dimorphos impact by the DART spacecraft, we estimate how asteroid collisions in the main belt may look in…
View article: Search and study for meteorites analogous to Didymos
Search and study for meteorites analogous to Didymos Open
The Hera mission will arrive at the Didymos system to study the efficiency of momentum transfer and to further investigate the binary system in great detail after the Double Asteroid Redirection Test (DART) mission impact. We took advantag…
View article: 1100 days in the life of the supernova 2018ibb
1100 days in the life of the supernova 2018ibb Open
Stars with zero-age main sequence masses between 140 and 260 M ⊙ are thought to explode as pair-instability supernovae (PISNe). During their thermonuclear runaway, PISNe can produce up to several tens of solar masses of radioactive nickel,…
View article: Secular change in the spin states of asteroids due to radiation and gravitation torques. New detections and updates of the YORP effect
Secular change in the spin states of asteroids due to radiation and gravitation torques. New detections and updates of the YORP effect Open
The rotation state of small asteroids is affected in the long term by perturbing torques of gravitational and radiative origin (the YORP effect). Direct observational evidence of the YORP effect is the primary goal of our work. We carried …
View article: Secular change in the spin states of asteroids due to radiation and gravitation torques
Secular change in the spin states of asteroids due to radiation and gravitation torques Open
Context . The rotation state of small asteroids is affected in the long term by perturbing torques of gravitational and radiative origin (the YORP effect). The former can be detected by a change in the spin-axis orientation in the inertial…
View article: UV to near-IR observations of the DART-Dimorphos collision
UV to near-IR observations of the DART-Dimorphos collision Open
The impact of the Double Asteroid Redirection Test (DART) spacecraft with Dimorphos allows us to study asteroid collision physics, including momentum transfer, the ejecta properties, and the visibility of such events in the Solar system. W…
View article: Near-IR Spectral Observations of the Didymos System: Daily Evolution Before and After the DART Impact Indicates that Dimorphos Originated from Didymos
Near-IR Spectral Observations of the Didymos System: Daily Evolution Before and After the DART Impact Indicates that Dimorphos Originated from Didymos Open
Ejecta from Dimorphos following the DART mission impact significantly increased the brightness of the Didymos–Dimorphos system, allowing us to examine subsurface material. We report daily near-IR spectroscopic observations of the Didymos s…
View article: UV to near-IR observations of the DART-Dimorphos collision
UV to near-IR observations of the DART-Dimorphos collision Open
The impact of the Double Asteroid Redirection Test (DART) spacecraft with Dimorphos allows us to study asteroid collision physics, including momentum transfer, the ejecta properties, and the visibility of such events in the Solar System. W…
View article: Near-IR Spectral Observations of the Didymos System -- Daily Evolution Before and After the DART Impact, Indicates Dimorphos Originated from Didymos
Near-IR Spectral Observations of the Didymos System -- Daily Evolution Before and After the DART Impact, Indicates Dimorphos Originated from Didymos Open
Ejecta from Dimorphos following the DART mission impact, significantly increased the brightness of the Didymos-Dimorphos system, allowing us to examine sub-surface material. We report daily near-IR spectroscopic observations of the Didymos…
View article: A search for Kuiper belt occultations using the Weizmann Fast Astronomical Survey Telescope
A search for Kuiper belt occultations using the Weizmann Fast Astronomical Survey Telescope Open
Measuring the size distribution of small (kilometre-scale) Kuiper belt objects (KBOs) can help constrain models of Solar system formation and planetary migration. Such small, distant bodies are hard to detect with current or planned telesc…
View article: The Large Array Survey Telescope—System Overview and Performances
The Large Array Survey Telescope—System Overview and Performances Open
The Large Array Survey Telescope (LAST) is a wide-field visible-light telescope array designed to explore the variable and transient sky with a high cadence. LAST will be composed of 48, 28 cm f/2.2 telescopes (32 already installed) equipp…
View article: 1100 days in the life of the supernova 2018ibb -- The best pair-instability supernova candidate, to date
1100 days in the life of the supernova 2018ibb -- The best pair-instability supernova candidate, to date Open
Abridged - Stars with ZAMS masses between 140 and $260 M_\odot$ are thought to explode as pair-instability supernovae (PISNe). During their thermonuclear runaway, PISNe can produce up to several tens of solar masses of radioactive nickel, …
View article: A search for Kuiper Belt occultations using the Weizmann Fast Astronomical Survey Telescope
A search for Kuiper Belt occultations using the Weizmann Fast Astronomical Survey Telescope Open
Measuring the size distribution of small (km-scale) KBOs can help constrain models of Solar System formation and planetary migration. Such small, distant bodies are hard to detect with current or planned telescopes, but can be identified a…
View article: Observational characterization of the ejecta from the DART-Dimorphos impact
Observational characterization of the ejecta from the DART-Dimorphos impact Open
The Double Asteroid Redirection Test1,2 (DART) was intended to test planetary defense strategies via the reaction of the near-Earth asteroid Dimorphos, a satellite of Didymous, to a spacecraft impact. Pre-impact modeling3–7 predicted a mom…
View article: Astrometric detection of binary asteroids
Astrometric detection of binary asteroids Open
Binary asteroids probe thermal-radiation effects on the main-belt asteroids' evolution. We discuss the possibility of detecting binary minor planet systems by the astrometric wobble of the center-of-light around the center-of-mass. This me…
View article: The debiased compositional distribution of Near-Earth Objects
The debiased compositional distribution of Near-Earth Objects Open
<p>We report 491 new near-infrared spectroscopic measurements of 420 Near-Earth Objects (NEOs) collected on NASA&#8217;s IRTF in the context of MITHNEOS (PI: DeMeo). The measurements were combined with previously published data (…
View article: Apophis Planetary Defense Campaign
Apophis Planetary Defense Campaign Open
We describe results of a planetary defense exercise conducted during the close approach to Earth by the near-Earth asteroid (99942) Apophis during 2020 December–2021 March. The planetary defense community has been conducting observational …
View article: The Debiased Compositional Distribution of MITHNEOS: Global Match between the Near-Earth and Main-belt Asteroid Populations, and Excess of D-type Near-Earth Objects
The Debiased Compositional Distribution of MITHNEOS: Global Match between the Near-Earth and Main-belt Asteroid Populations, and Excess of D-type Near-Earth Objects Open
We report 491 new near-infrared spectroscopic measurements of 420 near-Earth objects (NEOs) collected on the NASA InfraRed Telescope Facility as part of the MIT-Hawaii NEO Spectroscopic Survey. These measurements were combined with previou…
View article: Connecting Asteroids and Meteorites with visible and near-infrared spectroscopy
Connecting Asteroids and Meteorites with visible and near-infrared spectroscopy Open
We identify spectral similarities between asteroids and meteorites. We identify spectral matches between 500 asteroid spectra and over 1,000 samples of RELAB meteorite spectra over 0.45-2.5 microns. We reproduce many major and previously k…