- ID:
- ivo://CDS.VizieR/J/MNRAS/457/1320
- Title:
- OGLE-III planet detection efficiency
- Short Name:
- J/MNRAS/457/1320
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We use six years (2003-2008) of Optical Gravitational Lensing Experiment-III microlensing observations to derive the survey detection efficiency for a range of planetary masses and projected distances from the host star. We perform an independent analysis of the microlensing light curves to extract the event parameters and compute the planet detection probability given the data. 2433 light curves satisfy our quality selection criteria and are retained for further processing. The aggregate of the detection probabilities over the range explored yields the expected number of microlensing planet detections. We employ a Galactic model to convert this distribution from dimensionless to physical units, {alpha}/au and M_{earth}_ The survey sensitivity to small planets is highest in the range 1-4au, shifting to slightly larger separations for more massive ones.
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Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/522/A29
- Title:
- OGLE2-TR-L9 g'r'i'z' light curves
- Short Name:
- J/A+A/522/A29
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Repeated observations of exoplanet transits allow us to refine the planetary parameters and probe them for any time dependent variations. In particular deviations of the period from a strictly linear ephemeris, transit timing variations (TTVs), can indicate the presence of additional bodies in the planetary system. Aims: Our goal was to reexamine the largely unstudied OGLE2-TR-L9 system with high cadence, multi-color photometry in order to refine the planetary parameters and probe the system for TTVs. From our analysis we find that the semi-major axis and the inclination differ from the previously published values. With the newly observed transits, we were able to refine the ephemeris to 2454492.80008(+/-0.00014) +2.48553417(+/-6.4)x10^-7^E. The newly derived parameters are a=0.0418(+/-0.0015)AU, r_p_=1.67(+/-0.05) R_j_, and inc=82.47{deg}(+/-0.12), differing significantly in a and inc from the previously published values. Within our data, we find indications for TTVs.
- ID:
- ivo://CDS.VizieR/J/A+A/505/901
- Title:
- OGLE-TR-10 u', g' and i'-band photometry
- Short Name:
- J/A+A/505/901
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report a stellar flare occurring during a transit of the exoplanet OGLE-TR-10b, an event not previously reported in the literature. This reduces the observed transit depth, particularly in the u'-band, but flaring could also be significant in other bands and could lead to incorrect planetary parameters. We suggest that OGLE-TR-10a is an active planet-hosting star and has an unusually high X-ray luminosity.
- ID:
- ivo://CDS.VizieR/J/ApJ/727/102
- Title:
- On the frequency of Jupiter analogs
- Short Name:
- J/ApJ/727/102
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Anglo-Australian Planet Search has now accumulated 12 years of radial-velocity data with long-term instrumental precision better than 3m/s. In this paper, we expand on earlier simulation work, to probe the frequency of near-circular, long-period gas-giant planets residing at orbital distances of 3-6AU -the so-called Jupiter analogs. We present the first comprehensive analysis of the frequency of these objects based on radial-velocity data. We find that 3.3% of stars in our sample host Jupiter analogs; detailed, star-by-star simulations show that no more than 37% of stars host a giant planet between 3 and 6AU.
- ID:
- ivo://CDS.VizieR/J/AJ/160/282
- Title:
- Optical and IR spectroscopy of Europa
- Short Name:
- J/AJ/160/282
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The composition of Europa's trailing hemisphere reflects the combined influences of endogenous geologic resurfacing and exogenous sulfur radiolysis. Using spatially resolved visible-wavelength spectra of Europa obtained with the Hubble Space Telescope, we map multiple spectral features across the trailing hemisphere and compare their geographies with the distributions of large-scale geology, magnetospheric bombardment, and surface color. Based on such comparisons, we interpret some aspects of our spectra as indicative of purely exogenous sulfur radiolysis products and other aspects as indicative of radiolysis products formed from a mixture of endogenous material and magnetospheric sulfur. The spatial distributions of two of the absorptions seen in our spectra-a widespread downturn toward the near-UV and a distinct feature at 530nm-appear consistent with sulfur allotropes previously suggested from ground-based spectrophotometry. However, the geographies of two additional features-an absorption feature at 360nm and the spectral slope at red wavelengths-are more consistent with endogenous material that has been altered by sulfur radiolysis. We suggest irradiated sulfate salts as potential candidates for this material, but we are unable to identify particular species with the available data.
- ID:
- ivo://CDS.VizieR/J/MNRAS/454/3094
- Title:
- Optical transit light curves of WASP-57
- Short Name:
- J/MNRAS/454/3094
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Transits in the WASP-57 planetary system have been found to occur half an hour earlier than expected. We present 10 transit light curves from amateur telescopes, on which this discovery was based, 13 transit light curves from professional facilities which confirm and refine this finding, and high-resolution imaging which show no evidence for nearby companions. We use these data to determine a new and precise orbital ephemeris, and measure the physical properties of the system. Our revised orbital period is 4.5 s shorter than found from the discovery data alone, which explains the early occurrence of the transits. We also find both the star and planet to be larger and less massive than previously thought. The measured mass and radius of the planet are now consistent with theoretical models of gas giants containing no heavy-element core, as expected for the subsolar metallicity of the host star. Two transits were observed simultaneously in four passbands. We use the resulting light curves to measure the planet's radius as a function of wavelength, finding that our data are sufficient in principle but not in practise to constrain its atmospheric properties. We conclude with a discussion of the current and future status of transmission photometry studies for probing the atmospheres of gas-giant transiting planets.
- ID:
- ivo://CDS.VizieR/J/A+A/537/A147
- Title:
- Optimizing exoplanet transit searches
- Short Name:
- J/A+A/537/A147
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We investigate a method to increase the efficiency of a targeted exoplanet search with the transit technique by preselecting a subset of candidates from large catalogs of stars. Assuming spin-orbit alignment, this can be achieved by considering stars that have a higher probability to be oriented nearly equator-on (inclination close to 90{deg}).
- ID:
- ivo://CDS.VizieR/J/MNRAS/394/1695
- Title:
- Orbits of {beta} Ret and {nu} Oct
- Short Name:
- J/MNRAS/394/1695
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- New astrometric-spectroscopic orbital solutions for the single-line K-giant binaries beta Reticuli (P~5.2yr, e=0.3346+/-0.0004) and nu Octantis (P~2.9yr, e=0.2358+/-0.0003) have been derived based on high-precision spectroscopic radial velocities (RVs) and the Hipparcos astrometry.
- ID:
- ivo://CDS.VizieR/J/AJ/116/1998
- Title:
- Outer planetary systems
- Short Name:
- J/AJ/116/1998
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In order to better understand the range of dynamically long-lived giant planet systems, we present the results of a set of bottom-up numerical simulations designed to generate plausible giant planet systems from a large number of planetary embryos. Our simulations produced systems that are stable for at least a billion years and that exhibit a wide range of characteristics. Some of these systems are reminiscent of the outer solar system. The number of planets ranged from one to seven. Many systems contained only Uranus-mass objects. We constructed systems that were more compact than the outer solar system and systems that were much sparser, with planets on very eccentric orbits. Perhaps most surprisingly, some of the systems that we constructed were stable for at least a billion years despite undergoing macroscopic orbital changes on much shorter timescales.
- ID:
- ivo://CDS.VizieR/J/ApJ/703/L99
- Title:
- Outlandish orbit of HAT-P-7b
- Short Name:
- J/ApJ/703/L99
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We show that the exoplanet HAT-P-7b has an extremely tilted orbit, with a true angle of at least 86{deg} with respect to its parent star's equatorial plane, and a strong possibility of retrograde motion. We also report evidence for an additional planet or companion star. The evidence for the unparalleled orbit and the third body is based on precise observations of the star's apparent radial velocity (RV). The anomalous RV due to rotation (the Rossiter-McLaughlin effect) was found to be a blueshift during the first half of the transit and a redshift during the second half, an inversion of the usual pattern, implying that the angle between the sky-projected orbital and stellar angular momentum vectors is 182.5{deg}+/-9.4{deg}. The third body is implicated by excess RV variation of the host star over 2yr. Some possible explanations for the tilted orbit of HAT-P-7b are a close encounter with another planet, the Kozai effect, and resonant capture by an inward-migrating outer planet.