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$v_W$ leptokurtic asteroid families are families for which the distribution of the normal component of the terminal ejection velocity field $v_W$ is characterized by a positive value of the ${\gamma}_2$ Pearson kurtosis, i.e., they have a…

Earth and Planetary Astrophysics · Physics 2016-08-24 V. Carruba , R. C. Domingos , S. Aljbaae , M. Huaman

We searched for young asteroid families -- those with ages t_age < 10 Myr and at least three members -- using the proper element catalog from Nesvorny et al. (2024). Our approach employed the Hierarchical Clustering Method (HCM) in a…

Earth and Planetary Astrophysics · Physics 2025-08-04 David Nesvorny , David Vokrouhlicky , Miroslav Broz , Fernando V. Roig

Recent observations of the size-frequency distribution of zodiacal cloud particles obtained from the cratering record on the LDEF satellite (Love and Brownlee 1993) reveal a significant large particle population (100 micron diameter or…

Astrophysics · Physics 2009-10-31 K. Grogan , S. F. Dermott , D. D. Durda

Most existing studies of the angular momentum evolution of young stellar populations have focused on the youngest (1-3 Myr) T Tauri stars. In contrast, the angular momentum distributions of older T Tauri stars (4-10 Myr) have been less…

In our previous study of low mass stars using TESS, we found a handful which show a periodic modulation on a period <1 d but also displayed no flaring activity. Here we present the results of a systematic search for Ultra Fast Rotators…

Solar and Stellar Astrophysics · Physics 2020-07-22 G. Ramsay , J. G. Doyle , L. Doyle

We investigate the flare-frequency distributions of 5 M-dwarfs that experienced superflares with energies in excess of $10^{33}$ erg detected by ASAS-SN. We use K2 and TESS short-cadence observations along with archival ASAS-SN data to…

We use TESS full-frame imaging data to investigate the angular momentum evolution of young stars in Orion Complex. We confirm recent findings that stars with rotation periods faster than 2 d are overwhelmingly binaries, with typical…

Solar and Stellar Astrophysics · Physics 2023-04-05 Marina Kounkel , Keivan G. Stassun , Lynne A. Hillenbrand , Jesús Hernández , Javier Serna , Jason Lee Curtis

Here we present the results of visible range light curve observations of ten Centaurs using the Kepler Space Telescope in the framework of the K2 mission. Well defined periodic light curves are obtained in six cases allowing us to derive…

The Asteroid Belt and the Kuiper Belt are relics from the formation of our solar system. Understanding the size and spin distribution of the two belts is crucial for a deeper understanding of the formation of our solar system and the…

Earth and Planetary Astrophysics · Physics 2015-02-20 Elad Steinberg , Re'em Sari

We have searched for stellar activity cycles in late low mass M dwarfs (M0--M6) located in the TESS north and south continuous viewing zones using data from sectors 1--61 (Cycle 1 to part way through Cycle 5). We utilise TESS-SPOC data…

Solar and Stellar Astrophysics · Physics 2024-09-25 Gavin Ramsay , Pasi Hakala , J. Gerry Doyle

Rotation period clustering in prograde/retrograde rotators might indicate the preliminary indication of the Slivan state in the Koronis family as a result of the YORP effect. We follow the general scenario of dispersion in semimajor axis of…

Earth and Planetary Astrophysics · Physics 2016-01-14 Chan-Kao Chang , Hsing-Wen Lin , Wing-Huen Ip

Context. Gamma Doradus (hereafter $\gamma$~Dor) stars are gravity-mode pulsators whose periods carry information about the internal structure of the star. These periods are especially sensitive to the internal rotation and chemical mixing,…

Solar and Stellar Astrophysics · Physics 2022-12-21 Stefano Garcia , Timothy Van Reeth , Joris De Ridder , Conny Aerts

We present 24 new dense lightcurves of the near-Earth asteroids (3103) Eger, (161989) Cacus, (2100) Ra-Shalom and (12711) Tukmit, obtained with the Instituto Astrof\'isico Canarias 80 and Telescopio Abierto Remoto 2 telescopes at the Teide…

We have searched for short periodicities in the light curves of stars with $T_{\rm eff}$ cooler than 4000 K made from 2-minute cadence data obtained in TESS sectors 1 and 2. Herein we report the discovery of 10 rapidly rotating M-dwarfs…

We analyze K2 light curves for 132 low-mass ($1\ \gtrsim\ M_*\ \gtrsim\ 0.1$~${M_{\odot}}$) members of the 600--800~Myr-old Hyades cluster and measure rotation periods ($P_{rot}$) for 116 of these stars. These include 93 stars with no prior…

Solar and Stellar Astrophysics · Physics 2019-07-17 S. T. Douglas , J. L. Curtis , M. A. Agüeros , P. A. Cargile , J. M. Brewer , S. Meibom , T. Jansen

Among asteroids there exist ambiguities in their rotation period determinations. They are due to incomplete coverage of the rotation, noise and/or aliases resulting from gaps between separate lightcurves. To help to remove such…

Earth and Planetary Astrophysics · Physics 2017-07-17 M. Butkiewicz-Bąk , T. Kwiatkowski , P. Bartczak , G. Dudziński , A. Marciniak

The K2 mission of the Kepler Space Telescope allowed the observations of light curves of small solar system bodies throughout the whole Solar system. In this paper we present the results of a collection of K2 transneptunian object…

Durda et al. (2004), using numerical models, suggested that binary asteroids with large separation, called Escaping Ejecta Binaries (EEBs), can be created by fragments ejected from a disruptive impact event. It is thought that six binary…

Earth and Planetary Astrophysics · Physics 2011-01-04 D. Polishook , N. Brosch , D. Prialnik

Context. A lot of photometric data is produced by surveys such as Pan-STARRS, LONEOS, WISE or Catalina. These data are a rich source of information about the physical properties of asteroids. There are several possible approaches for…

Due to the failure of the second reaction wheel, a new mission was conceived for the otherwise healthy Kepler space telescope. In the course of the K2 Mission, the telescope is staring at the plane of the Ecliptic, hence thousands of Solar…

Earth and Planetary Astrophysics · Physics 2016-11-30 R. Szabó , A. Pál , K. Sárneczky , Gy. M. Szabó , L. Molnár , L. L. Kiss , O. Hanyecz , E. Plachy , Cs. Kiss