The authors note that the planet receives 1.27 times the Earth's insolation, placing it squarely in the optimistic habitable zone of its host star, and is likely synchronized or pseudo-synchronized. (2023) measure an orbital period for TOI-700 e of 27.8 days and radius of 0.95 R Earth, estimate a mass of 0.845 M Earth based on the forecaster package (with 87% probability). The authors combined custom-made short cadence TESS light-curves from 21 sectors with observations from the CAO 61-cm telescope, performed detailed vetting analysis with the DAVE and VESTA pipelines, and used the EXOFAST V2 package for a global fit to all available photometry. The host star of TOI-700 is an inactive M2.5 M dwarf at a distance of 31 parsecs, with a mass of 0.415 M Sun, radius of 0.421 R Sun, and Teff = 3459 K. (2023) present the discovery and analysis of a second planet, TOI-700 e, residing in the habitable zone of the multi-planet system TOI-700. Especially interesting are systems where two or more planets reside in the habitable zone, just like our own Solar System. Multi-planet systems of transiting planets are ideal laboratories for comparative exoplanetology where the properties of individual planets can be compared and contrasted based on the assumption of co-evolution. The improved photometric precision of faint stars as provided by TGLC will, in turn, enhance the discovery potential and scientific impact of the TESS data.Ī Second Earth-Sized Planet in the Habitable Zone of the M Dwarf, TOI-700 (Gilbert et al. The TGLC data is available on MAST as high level science products (Sector 1 at the time of writing), and the open-source software package (``tglc'') which can be used to extract custom light-curves is also available on GitHub. Han and Brandt (2023) argue that their light-curves reach photometric precision close to the instrumental noise and, based on a case study of five eclipsing binary stars, note that they show lower noise compared to QLP and Eleanor light-curves. The authors use the latter to constrain the field stars in the TESS images and perform point-spread function photometry to extract TESS light-curves with a percent-level precision for targets brighter than T = 16 mag. Han and Brandt (2023) present the latest such effort in the form of TESS-Gaia Light Curves (TGLC) which are based on the combined analysis of TESS and Gaia data. Extracting high-precision light-curves from this treasure trove of data is an essential requirement to reach the aforementioned expectations, and has been the primary focus of several ongoing efforts. It is expected that the Full-Frame-Image data from TESS will yield tens of thousands of transiting exoplanets, hundreds of thousands of eclipsing binary stars and other variable objects, and millions of other astrophysical transients. TESS-Gaia Light Curve: a PSF-based TESS FFI light curve product (Han and Brandt 2023) : Welcome TESS followers to our latest news bulletin! This week, we are looking at three recent papers from the archive.
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