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2141. Identifying gaps in flaring Herbig Ae/Be disks
ID:
ivo://CDS.VizieR/J/A+A/555/A64
Title:
Identifying gaps in flaring Herbig Ae/Be disks
Short Name:
J/A+A/555/A64
Date:
21 Oct 2021
Publisher:
CDS
Description:
The evolution of protoplanetary disks towards mature planetary systems is expected to include the formation of 'gaps' in the disk possibly due to planet formation. We studied the disks of four key intermediate mass (Herbig Ae/Be) stars in order to understand the influence of gaps to their observational appearance. We investigate mid-infrared images and perform radiative transfer modeling to examine the radial distribution of dust and PAHs. Our solutions constrain the sizes of the gaps. For one particular object, HD 97048, this is the first detection of a disk gap. The large gaps deplete the entire population of silicate particles with temperatures suitable for prominent mid-infrared feature emission, while small carbonaceous grains and PAHs can still show prominent emission at mid-infrared wavelengths. The absence of silicate emission features is due to the presence of large gaps in the critical temperature regime. Our results suggest that many, if not all Herbig disks with weak or no silicate features in the spectrum are disks with large gaps and can be characterized as (pre-)transitional. We conclude that the evolution of Herbig stars follows two different paths. Competition between the timescales of inner versus outer disk evolution determine whether young protoplanetary disks evolve into transitional disks (due to planet formation in the inner disk) or into flat disks (due to the grain growth and dust settling in the outer disk).
2142. i filter photometry for HATS-25 through HATS-30
ID:
ivo://CDS.VizieR/J/AJ/152/108
Title:
i filter photometry for HATS-25 through HATS-30
Short Name:
J/AJ/152/108
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report six new inflated hot Jupiters (HATS-25b through HATS-30b) discovered using the HATSouth global network of automated telescopes. The planets orbit stars with V magnitudes in the range of ~12-14 and have masses in the largely populated 0.5M_J_--0.7M_J_ region of parameter space but span a wide variety of radii, from 1.17R_J_ to 1.75R_J_. HATS-25b, HATS-28b, HATS-29b, and HATS-30b are typical inflated hot Jupiters (R_p_=1.17--1.26R_J_) orbiting G-type stars in short period (P=3.2-4.6 days) orbits. However, HATS-26b (R_p_=1.75R_J_, P=3.3024days) and HATS-27b (R_p_=1.50R_J_, P=4.6370days) stand out as highly inflated planets orbiting slightly evolved F stars just after and in the turn-off points, respectively, which are among the least dense hot Jupiters, with densities of 0.153g/cm^3^ and 0.180g/cm^3^, respectively. All the presented exoplanets but HATS-27b are good targets for future atmospheric characterization studies, while HATS-27b is a prime target for Rossiter-McLaughlin monitoring in order to determine its spin-orbit alignment given the brightness (V=12.8) and stellar rotational velocity (vsini~9.3km/s) of the host star. These discoveries significantly increase the number of inflated hot Jupiters known, contributing to our understanding of the mechanism(s) responsible for hot Jupiter inflation.
2143. IGAPS. merged IPHAS and UVEX of northern Galactic plane
ID:
ivo://CDS.VizieR/V/165
Title:
IGAPS. merged IPHAS and UVEX of northern Galactic plane
Short Name:
V/165
Date:
21 Oct 2021
Publisher:
CDS
Description:
The INT Galactic Plane Survey (IGAPS) is the merger of the optical photometric surveys, IPHAS and UVEX, based on data from the Isaac Newton Telescope (INT) obtained between 2003 and 2018. Here, we present the IGAPS point source catalogue. It contains 295.4 million rows providing photometry in the filters, i, r, narrow-band H{alpha}, g, and URGO. The IGAPS footprint fills the Galactic coordinate range, |b|<5{deg} and 30{deg}<l<215{deg}. A uniform calibration, referred to as the Pan-STARRS system, is applied to g, r, and i, while the H{alpha} calibration is linked to r and then is reconciled via field overlaps. The astrometry in all five bands has been recalculated in the reference frame of Gaia Data Release 2. Down to i~20mag (Vega system), most stars are also detected in g, r, and H{alpha}. As exposures in the r band were obtained in both the IPHAS and UVEX surveys, typically a few years apart, the catalogue includes two distinct r measures, r_I_ and r_U_. The r 10{sigma} limiting magnitude is approximately 21, with median seeing of 1.1arcsec. Between approximately 13^th^ and 19^th^ mag in all bands, the photometry is internally reproducible to within 0.02 magnitudes. Stars brighter than r=19.5mag are tested for narrow-band H{alpha} excess signalling line emission, and for variation exceeding |r_I_-r_U_|=0.2mag. We find and flag 8292 candidate emission line stars and over 53000 variables (both at >5{sigma} confidence).
2144. IJKs photometry of Galactic bulge variables
ID:
ivo://CDS.VizieR/J/A+A/362/215
Title:
IJKs photometry of Galactic bulge variables
Short Name:
J/A+A/362/215
Date:
21 Oct 2021
Publisher:
CDS
Description:
Repeated DENIS observations (summer 1996 & 1998) in the J (1.25{mu}m) and the K_s_ (2.15{mu}m) bands are used to look for variables stars. We present two catalogues of ~1000 probable variables in an area of ~4deg^2^ of the inner galactic bulge. The first one contains ~720 variable star candidates which which show variability in the J and K_s_ while the second consists of sources only observed to be variable in K_s_ (~270 sources), mainly in regions whit high interstellar extinction.
2145. IJKs photometry of late-type stars in Draco dSph
ID:
ivo://CDS.VizieR/J/A+A/442/165
Title:
IJKs photometry of late-type stars in Draco dSph
Short Name:
J/A+A/442/165
Date:
21 Oct 2021
Publisher:
CDS
Description:
With the William Herschel Telescope in La Palma we made IJKs observations of an area of about 40'x30' of the Local Group galaxy Draco. This allows us to describe Draco's late-type stellar population across the whole galaxy at a photometric level 2mag deeper than the 2MASS survey. We detected the red giant branch (RGB) and measured the magnitude of the tip of the RGB in the three bands. From that in the I band we obtain a distance modulus of (m-M)_0=19.49+/-0.06(stat)+/-0.15(sys), in excellent agreement with a measurement from RR Lyrae stars. The peak of the (J-Ks)_0_ histogram at different M_Ks_ suggests that Draco has a mean [Fe/H]=-1.95+/-1.26 while fiducial RGB tracks of Galactic globular clusters indicate a mean [Fe/H]=-1.33+/-0.72 where the error corresponds to the spread around the mean value. There are significant differences between the colour-magnitude diagrams of stars in the inner, medium and outer areas of the galaxy. A metal poor (Z=0.0004) intermediate-age population (about 1.6Gyr old) is clearly present and emerges in particular between 6' and 12' from the centre of the galaxy. A few additional carbon star candidates have been identified from both their location in the colour-magnitude diagram and from an indication of variability. The large scale distribution of late-type stars is smooth but irregular in shape; this points at a variation of inclination with radius.
2146. IJKs photometry of late-type stars in NGC 6822
ID:
ivo://CDS.VizieR/J/A+A/429/837
Title:
IJKs photometry of late-type stars in NGC 6822
Short Name:
J/A+A/429/837
Date:
21 Oct 2021
Publisher:
CDS
Description:
Observations in the IJKs wave bands covering the central 20'x20' of the Local Group galaxy NGC 6822 have been made with the William Herschel Telescope in La Palma. They have allowed us to characterize, for the first time in the near-infrared across the whole galaxy, its late-type stellar population (i.e. red giant and asymptotic giant branch stars) and to derive from the ratio between carbon-rich and oxygen-rich asymptotic giant branch stars an indication about spatial variations in metallicity. These amount to about 1.56dex, twice of what has been previously found within each Magellanic Cloud using the same technique. We have calibrated our photometry on the DENIS (I-band) and 2MASS (J and Ks bands) data and obtained a distance modulus of (m-M)_0_=23.34(0.12) from the position of the tip of the RGB. The large scale distribution of late-type stars suggests that either the galaxy is viewed under a high inclination angle or it has a non-negligible thickness.
2147. IK photometry of faint Extremely Red Objects
ID:
ivo://CDS.VizieR/J/MNRAS/346/1125
Title:
IK photometry of faint Extremely Red Objects
Short Name:
J/MNRAS/346/1125
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results from a survey for extremely red objects (EROs) in deep, high-resolution optical images taken from the Hubble Space Telescope (HST) Medium Deep Survey. We have surveyed 35 deep F814W HST/WFPC2 fields in the near-infrared to a typical depth of K>20. From a total area of 206 arcmin^2^ and to a limit of K=20.0, we identify 224 EROs [(1.14+/-0.08)arcmin^-2^] with (I_814_-K)>=4.0 and 83 [(0.41+/-0.05)arcmin^-2^] with (I_814_-K)>=5.0.
2148. I light curves of RR Lyrae from OGLE II
ID:
ivo://CDS.VizieR/J/other/PZP/9.5
Title:
I light curves of RR Lyrae from OGLE II
Short Name:
J/other/PZP/9.5
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the discovery of ten RR Lyrae variables. They were found in a search for new variables in the OGLE II Photometric Database (Szymanski 2005AcA....55...43S, Udalski et al. 1997AcA....47..319U). Suitable parameters (e.g. Isig>0.1, e_Imed<Isig) were used in the OGLE Photometry Database Query Page (http://ogledb.astrouw.edu.pl/~ogle/photdb/) for stars in the Galactic Disk. Period analysis was made with the software AVE (GEA).
2149. Images of two DQ white dwarfs
ID:
ivo://CDS.VizieR/J/A+A/544/L6
Title:
Images of two DQ white dwarfs
Short Name:
J/A+A/544/L6
Date:
21 Oct 2021
Publisher:
CDS
Description:
The intensity profiles of the C2 Swan bands in cool DQ white dwarfs cannot be adequately fitted with models that otherwise succesfully reproduce spectral features of the molecule CH in these stars. Initial modelling showed that a two-component atmosphere in the style of a spot might be able to solve the problem. We photometrically observed the two cool DQ white dwarfs GJ1117 and EGGR78 to search for variability caused by stellar spots. We have not found any such variability, but we estimate the effects of hypothetical spots on lightcurves. We also estimate detection probabilities for spots in different configurations. Alternative explanations of the problem are needed and briefly discussed.
2150. Imaging and spectroscopy around PKS 0405-123
ID:
ivo://CDS.VizieR/J/ApJ/643/680
Title:
Imaging and spectroscopy around PKS 0405-123
Short Name:
J/ApJ/643/680
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a galaxy survey of the field surrounding PKS 0405-123 performed with the WFCCD spectrometer at Las Campanas Observatory. The survey is comprised of two data sets: (1) a greater than 95% complete survey to R=20mag of the field centered on PKS 0405-123 with 10' radius (L~0.1L* and radius of 1Mpc at z=0.1); and (2) a set of four discontiguous (i.e., non-overlapping), flanking fields covering ~1deg^2^ area with completeness ~90% to R=19.5mag. With these data sets, one can examine the local and large-scale galactic environment of the absorption systems identified toward PKS 0405-123. In this paper, we focus on the O VI systems analyzed in Paper I (Prochaska et al., 2004, Cat. <J/ApJ/617/718>). The results suggest that this gas arises in a diverse set of galactic environments including the halos of individual galaxies, galaxy groups, filamentary-like structures, and also regions devoid of luminous galaxies. In this small sample, there are no obvious trends between galactic environment and the physical properties of the gas. Furthermore, we find similar results for a set of absorption systems with comparable NHI but no detectable metal lines. The observations indicate that metals are distributed throughout a wide range of environments in the local universe. Future papers in this series will address the distribution of galactic environments associated with metal-line systems and the Ly forest based on data for over 10 additional fields. All of the spectra and fits tables are available at http://www.ucolick.org/~xavier/WFCCDOVI/