TESS Sector 12 planets are out! And a
lot from prior sectors. BD+04 701 is a (visual?) binary system with a TESS planet candidate around each star. I don't have data right now on the system to render it as a binary, rather than as two separate single stars. Though with as interesting as this is it'll probably be the target of later research anyway.
A certain likely-well-meaning 'citizen scientist' has gotten into the ExoFOP and started adding numerous CTOIs because "dips in light curve jpg suggests multiple planetary system," rather than offering any parameters for these planets. Based on the description, it looks like they're using a rather unscientific process of looking at the light curve by-eye, noting there are dots that are under the detrended baseline, and saying "Yep! That's a multi-planet system." It's horribly unscientific. I've sent an e-mail to David Latham, an (the?) administrator of the ExoFOP about this, asking for clarification and/or action to resolve this, and a few days later the CTOI submission system was disabled... In the mean time, just note that there are
many supposed parameter-less CTOIs that have not been added.
EPIC 210605073 has been the 'other' extrasolar asteroid. But the star's nature has been somewhat ambiguous.
Adams, et al. (2016) took a look at the system and found the colours to be consistent with a F-type star, but "no measurements of the metallicity, log
g, or photometric extinction are available to better constrain the estimate." Table 2 in Adams, et al's analysis "assumed log
g = 4.0." Consistent indeed with an F-type star. But there's also a paper out using SDSS DR7 suggesting EPIC 210605073 has a log
g of 8.25. This bit of information was apparently not included in this analyses (or was rejected?).
Sluijs & Eylen (2017) did a survey of white dwarfs, noted Adams, et al.'s analysis, stating only that "a recent photometric analysis suggests the star is (contaminated with) an F0 companion," without commenting on the SDSS DR7 data.
Between the choice of the log
g measurement in SDSS DR7 and the argument based on photometry but assuming a log
g of 4, it would seem that the reasonable choice would be the white dwarf model. But the transit duration as reported in the ExoFOP for EPIC 210605073 is just over 0.9 hours. This
is inconsistent with the star being a white dwarf for any plausible orbit for the companion (assuming, of course, it is not an astrophysical false positive). Between a bad transit duration and a bad log
g, it seems overwhelmingly more plausible that the log
g is bad. Consequently, EPIC 210605073 b has been changed from an asteroid to a planet (or more accurately, the star was changed from a white dwarf to a F0 type star, and my programme scaled up the orbiting body based on it's transit depth accordingly).
There was a paper from
Kruse, et al, presenting some 374 new planet candidates from Kepler-K2. Their work was to run the Kepler-K2 data through an algorithm that recovered transit-like signatures, apparently without a lot of regard for prior research done on these systems. As such, many of the new candidates presented in this work are known eclipsing binary stars. Consequently, some discretion was used in which systems were added. At K2-24,
Petigura, et al. (2018) reported a
M sin
i = 54
M_e planet in a 428 day orbit, and this new paper reports a single-transit candidate at this system. I don't know if the two planets are the same but it's possible. I won't make any such assumption though.
- The locations of planets and candidate planets from the Kepler-K2 campaigns, viewed from far away.
01 Aug 2019
- 206 TESS candidate planets added (TOI-844 through TOI-1048).
- 8 TESS candidate planets have been determined to be false positives since the last update and removed.
- Added TOI-# ID's for known transiting planets detected by TESS (WASP-132, WASP-180).
- Added 273 new Kepler-K2 planet candidates from Campaigns 0-8 (Kruse, et al.).
- Added stellar companions to λ2 For, HD 33283, HD 107148, HD 108863, HD 170469, 18 Del, HD 4113, HAT-P-4, HATS-1. (
Mugrauer, et al. 2014), HD 17926 (
Vanderburg, et al. 2019), KELT-22 (
Labadie-Bartz, et al. 2018), KELT-23 (
Johns, et al. 2019),
- Added
OGLE-2018-BLG-1011, K2-43 c, K2-198 c and d (
Hedges, et al.),
OGLE-2015-BLG-1649L, WASP-178, WASP-184, WASP-185 & WASP-192 (
Hellier, et al.),
K2-310 and
K2-146 c.
- Added missing planet candidates from Kepler DR5 at Kepler-913, Kepler-1178, Kepler-1185, Kepler-1211, Kepler-1270,
- Added unconfirmed planets
2MASS J06101557+2436535 b,
Kepler-210 d (from TTV),
- Updated Kepler-29, Kepler-36, Kepler-177 and KOI-1783 (
Vissapragada, et al).
- Removed duplicate GJ 3323 and GJ 682 star definitions.
- Removed HD 10383 b and HD 16559 b. They were in the
first version of its discovery paper, but the paper did not include it in its
final version.
- KOI-2533.02, KOI-410.01, KOI-531.01, have been found to be false positives and removed.
- Fixed issue determining eccentric anomaly.
- Finished giving transiting planets correct transit times where possible (SWEEPS planets have no published T_transit, for example).
- Implemented correct T_Peri times for radial velocity planets where available.
- Changed disposition of several planets from
Rowe, et al. (2014) to 'unconfirmed' in alignment with the NASA Exoplanet Archive.
- Changed structure of programatically generated .ssc and .stc files to conform to Celestia Origin standards. I will do this with the manually-produced Stars_Binary_Exoplanets.stc soon.
7938 planets (+1 asteroid)
4236 confirmed.
3702 unconfirmed.