Dispersed Matter Planet Project

https://www.dailymail.co.uk/sciencetech/article-7822005/Six-hot-rocky-exoplanets-shed-light-geology-planets-solar-system.html

Six hot rocky planets orbiting very close to their stars could shed light on the geology of planets in our solar system and how the Earth was formed

All the discovered planets were within our local region of the Milky Way galaxy
- They were orbiting stars between 160 and  440 light years away from Earth
- They are giving scientists a chance to get better measurements of rocky planets
- The planets have 'very hot' surface temperatures ranging from 2,012F to 3,272F

Nature :

Papers:

A Compact Multi-Planet System Around a Bright Nearby Star from the Dispersed Matter Planet Project
https://www.nature.com/articles/s41550-019-0974-x.epdf?referrer_access_token=RQkHXbaJ1DoZmf6k7GPjQNRgN0jAjWel9jnR3ZoTv0P2UUHvR4-_G10l1j70VbKIggoGh8c4uWafEyO8YIfXq6hUJtlxy7wQvwokPDujcehvBXk_D53b59s3Ijy-hsEUpdHuia_Z0HaW_m4H1EjsnmseyYvQuPhX1RO9YkxdGaSUlAKXwHUUzA5M9dGYg2OCcKPp3_yOg_rIuSWBLIScEyBAzkfH3UXTCpyPB_v4HzC4_e2LTaEjGhMzaBkz8s3DYJ2SjImwJWs5CkctVlWf6KxdRjClG651yiR4cxFA8vo%3D&tracking_referrer=www.scientificamerican.com

Dispersed Matter Planet Project Discoveries of Ablating Planets Orbiting Nearby Bright Stars
https://www.nature.com/articles/s41550-019-0973-y.epdf?referrer_access_token=wpu04wmwNBFz-8oJqiPWWdRgN0jAjWel9jnR3ZoTv0NvERLh1mNdK5ws2pnOAy8iLJEnZ_lIP0hu-puU75p2Wl5gRf5BCh_b744c3AQqpfb1060_ik075n44JBZ4E3eBZcrIAi35m-pLi-OvL3Y0w1abEYy6IR5Oz4N5iOvzkcEpX92I9aNfNNyA_m6GJaaAC1RB1-z5CSuUfjTk5ZWFIqlaUn6ts7gYBCrUEvA6JzgkZslLEZug6VMQrXY7OaafPFulAF5oectcPWB_1j9X39MPd9fWyjkgICkLZgR84fU%3D&tracking_referrer=www.scientificamerican.com

An Ablating 2.6 M_Earth Planet in an Eccentric Binary from the Dispersed Matter Planet Project
https://www.nature.com/articles/s41550-019-0972-z.epdf?referrer_access_token=WimYTiTH9IO1kU4_pXJDWNRgN0jAjWel9jnR3ZoTv0PI8WS5AMvixIufLFr2TXrBjt2q4P9PWZp6l3GwaPcpEnySWO-1apmJkejCWjrdLeJThKMUayVC9aybaz3n0Il63Pj0Zfe33LNTnHT0DVz8JICT6GYc0s58oGb1LZbS6gnkyynCl9xvZfj2RXjmpHpMPMMKxSM0008oETCai2c3cx1XIXylrTHGE4q5Bm1STTeit5HJ3ku6VCdFzYHi-jUoK7IhPcl2yNs5lq8IJaAFdEYMIw3FRJFxTz2yNcarjPk%3D&tracking_referrer=www.scientificamerican.com

Now also on arXiv:

Staab et al. "A Compact Multi-Planet System Around a Bright Nearby Star from the Dispersed Matter Planet Project"
https://arxiv.org/abs/1912.10792

Haswell et al. "Dispersed Matter Planet Project Discoveries of Ablating Planets Orbiting Nearby Bright Stars"
https://arxiv.org/abs/1912.10874

Barnest et al. "An ablating super-Earth in an eccentric binary from the Dispersed Matter Planet Project"
https://arxiv.org/abs/1912.10793

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The DMPP-3 (HD 42936) system has a periastron separation between the binary stars (the secondary being right at the hydrogen-burning limit, likely spectral type L) of about 0.5 AU!

From the Haswell et al. paper:

Quote :

DMPP-2b and the recently announced discovery of 51 Peg c are currently the only RV discoveries of planets orbiting strongly pulsating stars.

Wait, what? Why wouldn't 51 Peg b count, and is 51 Peg a notably strongly-pulsating star? I suspect this is a misprint of Beta Pictoris c, but a second planet at 51 Peg would definitely be interesting.

Well, so many planets under the Christmas tree!

Happy holidays everyone!

Lazarus wrote:

I suspect this is a misprint of Beta Pictoris c

Looks like I was right, this has been updated in v2 of the paper.

Another possible planet at DMPP-1.

A possible transit of a disintegrating exoplanet in the nearby multiplanet system DMPP-1
https://arxiv.org/abs/2005.07086

Quote :

We analyse TESS photometry of DMPP-1 (HD 38677; TIC 66560666), a nearby F8V star hosting hot super-Earth planets and a warm Neptune. Using the Transit Least Squares algorithm and other methods we find a transit signal at P=3.2854+0.0032−0.0025 d with depth 87+25−30 ppm and false alarm probability 1.6%. This is shallower than hitherto published TESS discoveries. The 3.285 d signal is recovered for several, but not all, methods for detrending stellar astrophysical variability. Further observations are needed to improve the significance of the detection. If this transit were due to an Earth-like rocky planet it would have been detected in the RV data, but it is not. The TESS data cover seven individual transits, one of which is consistent with zero depth. The insolation of the putative planet is 990S⊕, typical of fluxes experienced by the three known catastrophically disintegrating exoplanets (CDEs). The transits can be self-consistently attributed to a CDE with a mass below the RV detection threshold. We searched for transits of the known RV planets, finding null results and detection thresholds of <100 ppm, which we quantify for each. The DMPP-1 planetary system was discovered as a consequence of circumstellar gas attributed to ablation of hot planets. The RV planets may have been ablated to near-pure iron cores. We place limits on the orbital inclinations of the RV planets where the expected transit depth exceeds the detection threshold. If the 3.2854 day transit detection is confirmed, e.g. with CHEOPS photometry, DMPP-1 would be a first-rate target for JWST spectroscopy.

Confirmation of DMPP-3 Ab and possible hints of an additional Earth-sized inner planet

DMPP-3: confirmation of short-period S-type planet(s) in a compact eccentric binary star system, and warnings about long-period RV planet detections
https://arxiv.org/abs/2305.06263

Welcome to DMPP-4 b:

http://exoplanet.eu/catalog/dmpp-4_b/

DMPP-4: Candidate sub-Neptune mass planets orbiting a naked-eye star
https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stad2109/7224603

Full text is open access.