- ID:
- ivo://CDS.VizieR/J/ApJS/245/29
- Title:
- Main-belt asteroid photometry from TESS
- Short Name:
- J/ApJS/245/29
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Transiting Exoplanet Survey Satellite (TESS) searches for planets transiting bright and nearby stars using high-cadence, large-scale photometric observations. Full frame images provided by the TESS mission include a large number of serendipitously observed main-belt asteroids (MBAs). Due to the cadence of the published full frame images, we are sensitive to periods as long as of order tens of days, a region of phase space that is generally not accessible through traditional observing. This work represents a much less biased measurement of the period distribution in this period range. We have derived rotation periods for 300 MBAs and have partial lightcurves for a further 7277 asteroids, including 43 with periods of P>100hr; this large number of slow rotators is predicted by theory. Of these slow rotators we find none requiring significant internal strength to resist rotational reshaping. We find our derived rotation periods to be in excellent agreement with results in the Lightcurve Database for the 55 targets that overlap. Over the nominal two-year lifetime of the mission, we expect the detection of around 85,000 unique asteroids with rotation period solutions for around 6000 asteroids. We project that the systematic analysis of the entire TESS data set will increase the number of known slow-rotating asteroids (period >100hr) by a factor of 10. Comparing our new period determinations with previous measurements in the literature, we find that the rotation period of asteroid (2320) Blarney has decreased by at least 20% over the past decade, potentially due to surface activity or subcatastrophic collisions.
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- ID:
- ivo://CDS.VizieR/J/A+A/578/A42
- Title:
- Main Belt asteroids observed by Spitzer
- Short Name:
- J/A+A/578/A42
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Multi-epoch Spitzer Space Telescope 24um data is utilized from the MIPSGAL and Taurus Legacy surveys to detect asteroids based on their relative motion. Infrared detections are matched to known asteroids and average diameters and albedos are derived using the Near Earth Asteroid Model (NEATM) for 1865 asteroids ranging in size from 0.2 to 169km. A small subsample of these objects was also detected by IRAS or MSX and the single wavelength albedo and diameter fits derived from these data are within the uncertainties of the IRAS and/or MSX derived albedos and diameters and available occultation diameters, which demonstrates the robustness of our technique. The mean geometric albedo of the small Main Belt asteroids in this sample is p_V_=0.134 with a sample standard deviation of 0.106. The albedo distribution of this sample is far more diverse than the IRAS or MSX samples. The cumulative size-frequency distribution of asteroids in the Main Belt at small diameters is directly derived and a 3{sigma} deviation from the fitted size-frequency distribution slope is found near 8km. Completeness limits of the optical and infrared surveys are discussed.
- ID:
- ivo://CDS.VizieR/J/A+A/596/A40
- Title:
- Main-belt asteroids optical light curves
- Short Name:
- J/A+A/596/A40
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Because the second reaction wheel failed, 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. Thousands of solar system bodies therefore cross the K2 fields and usually cause additional noise in the highly accurate photometric data. We here follow the principle that some person's noise is another person's signal and investigate the possibility of deriving continuous asteroid light curves. This is the first such endeavor. In general, we are interested in the photometric precision that the K2 mission can deliver on moving solar system bodies. In particular, we investigate space photometric optical light curves of main-belt asteroids. We studied the K2 superstamps that cover the fields of M35, and Neptune together with Nereid, which were observed in the long-cadence mode (29.4min sampling). Asteroid light curves were generated by applying elongated apertures. We used the Lomb-Scargle method to determine periodicities that are due to rotation.
- ID:
- ivo://CDS.VizieR/J/ApJ/771/40
- Title:
- Main-sequence A, F, G, and K stars photometry
- Short Name:
- J/ApJ/771/40
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Based on CHARA Array measurements, we present the angular diameters of 23 nearby, main-sequence stars, ranging from spectral types A7 to K0, 5 of which are exoplanet host stars. We derive linear radii, effective temperatures, and absolute luminosities of the stars using Hipparcos parallaxes and measured bolometric fluxes. The new data are combined with previously published values to create an Angular Diameter Anthology of measured angular diameters to main-sequence stars (luminosity classes V and IV). This compilation consists of 125 stars with diameter uncertainties of less than 5%, ranging in spectral types from A to M. The large quantity of empirical data is used to derive color-temperature relations to an assortment of color indices in the Johnson (BVR_J_I_J_JHK), Cousins (R_C_I_C_), Kron (R_K_I_K_), Sloan (griz), and WISE (W_3_W_4_) photometric systems. These relations have an average standard deviation of ~3% and are valid for stars with spectral types A0-M4. To derive even more accurate relations for Sun-like stars, we also determined these temperature relations omitting early-type stars (T_eff_>6750K) that may have biased luminosity estimates because of rapid rotation; for this subset the dispersion is only ~2.5%. We find effective temperatures in agreement within a couple of percent for the interferometrically characterized sample of main-sequence stars compared to those derived via the infrared flux method and spectroscopic analysis.
- ID:
- ivo://CDS.VizieR/J/MNRAS/418/2219
- Title:
- Main sequence intrinsic colours: O8V to M0V
- Short Name:
- J/MNRAS/418/2219
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A new Monte Carlo method has been developed in order to derive ages of young embedded clusters in massive star-forming regions where there is strong differential reddening. After foreground and infrared excess source candidates are removed, each cluster candidate star is individually dereddened. Simulated clusters are constructed using isochrones, an initial mass function, realistic photometric errors, simulated background field populations and extinction distributions. These synthetic clusters are then dereddened in the same way as the real data, obtained from a deep near-infrared survey, and used to derive the ages of three embedded clusters. Results were found to be consistent with those determined using spectrophotometric methods. This new method provides way to determine the ages of embedded clusters when only photometric data are available and there is strong differential reddening.
- ID:
- ivo://CDS.VizieR/J/A+A/298/461
- Title:
- Main sequence of NGC 6171
- Short Name:
- J/A+A/298/461
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Deep J, K IR-array photometry for individual Main Sequence stars in NGC 6171 reaching K~18, about two magnitudes below the turnoff, is presented. The observations were made during 3 nights on June 1993 at the 2.2m ESO/MPI telescope at ESO (La Silla), equipped with the IR-array camera IRAC2.
- ID:
- ivo://CDS.VizieR/J/other/JAVSO/48.201
- Title:
- Maintaining the Ephemeris of 20 CoRoT planets
- Short Name:
- J/other/JAVSO/48
- Date:
- 22 Feb 2022
- Publisher:
- CDS
- Description:
- We present 33 transit minimum times of 20 transiting planets discovered by the CoRoT space mission, which have been obtained from ground-based observations since the mission's end in 2012, with the objective to maintain the ephemeris of these planets and to identify potential transit time variations. Twelve of the observed planets are in the CoRoT fields near the galactic center and the remaining eight planets are in the fields near the anticenter. We detect indications for significant transit timing variations in the cases of CoRoT 3b, 11b, 13b, 27b. For two more planets (CoRoT 18b and 20b) we conclude that timing offsets in early follow-up observations led to ephemeris in discovery publications that are inconsistent with timings from follow-up observations in later epochs. In the case of CoRoT-20b, this might be due to the influence from a further non-transiting planet. We also note that a significant majority (23 of 33) of our reported minimum times have negative O-C values, albeit most of them are within the expected uncertainty of the ephemeris.
- ID:
- ivo://CDS.VizieR/J/other/JAVSO/48.202
- Title:
- Maintaining the Ephemeris of 20 CoRoT planets (Deeg+, 2020)
- Short Name:
- J/other/JAVSO/48
- Date:
- 15 Dec 2020 09:14:31
- Publisher:
- CDS
- ID:
- ivo://CDS.VizieR/J/AJ/126/1183
- Title:
- Major galaxy mergers at z<~3
- Short Name:
- J/AJ/126/1183
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper presents direct evidence for hierarchical galaxy assembly out to redshifts z~3. We identify major mergers using the model-independent CAS (concentration, asymmetry, clumpiness) physical morphological system on galaxies detected, and photometrically selected, in the WFPC2 and NICMOS Hubble Deep Field North. We specifically use the asymmetric distributions of rest-frame optical light measured through the asymmetry parameter (A) to determine the fraction of galaxies undergoing major mergers as a function of redshift (z), stellar mass (M*), and absolute magnitude (M_B_).
- ID:
- ivo://CDS.VizieR/J/A+A/625/A46
- Title:
- Makemake (136472) long-term photometry
- Short Name:
- J/A+A/625/A46
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We aim to study the rotational properties of the dwarf planet Makemake. The photometric observations were carried out at different telescopes between 2006 and 2017. Most of the measurements were acquired in BVRI broad-band filters of a standard Johnson-Cousins photometric system. We found that Makemake rotates more slowly than was previously reported. A possible lightcurve asymmetry suggests a double-peaked period of P=22.8266+/-0.0001h. A small peak-to-peak lightcurve amplitude in R-filter A=0.032+/-0.005mag implies an almost spherical shape or near pole-on orientation. We also measured BVRI colours and the R-filter phase-angle slope and revised the absolute magnitudes. The absolute magnitude of Makemake remained unchanged since its discovery in 2005. No direct evidence of a newly discovered satellite was found in our photometric data, however we discuss the possible existence of another larger satellite.