L 98-59b is the smallest planet yet discovered by TESS satellite 

Posted: July 15, 2019 by oldbrew in Astronomy, Maths
Tags: , ,

Credit: NASA’s Goddard Space Flight Center


First the report, then a brief Talkshop analysis.

NASA’s Transiting Exoplanet Survey Satellite (TESS) has discovered a world between the sizes of Mars and Earth orbiting a bright, cool, nearby star, reports MessageToEagle.com.

The planet, called L 98-59b, marks the tiniest discovered by TESS to date.

Two other worlds orbit the same star.

While all three planets’ sizes are known, further study with other telescopes will be needed to determine if they have atmospheres and, if so, which gases are present.

The L 98-59 worlds nearly double the number of small exoplanets — that is, planets beyond our solar system — that have the best potential for this kind of follow-up.

“The discovery is a great engineering and scientific accomplishment for TESS,” Veselin Kostov, an astrophysicist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, and the SETI Institute in Mountain View, California, said in a press release.

Full report here.
– – –
Talkshop analysis

For the planets b,c and d the orbit numbers we can use here are:
519 b = 1169.4108 days
317 c = 1169.8568 d
157 d = 1169.8541 d
(orbit data from exoplanets.eu)

If the number for planet b was 2 less we would have these synodic ratios:
160 c-d: 200 b-c: 360 b-d = 4:5:9 (or 2²:5:3²).

So we suggest this is the fundamental resonance of this planetary system, although two ‘extra’ orbits of the small body are present in the full cycle (which adds 2 to b-c and b-d).

Comments
  1. JB says:

    It has been argued elsewhere that no objective proof has been found supporting these discoveries of exoplanets by occulting (rightly so IMO). The whole mechanism is based on unsubstantiated interpretation/supposition. But Oldbrew’s numerical reduction of their orbits to Phi relations is likely to be the best proof available until close in observation is possible.

  2. Curious George says:

    A bright cool star? I have a lot to learn…

  3. oldbrew says:

    It’s still 3500 degrees K, so not that cool.

  4. oldbrew says:

    Reminder from the moons of Pluto:

    The ratios of synodic periods are then such that there are 5 Styx–Hydra conjunctions and 3 Nix–Hydra conjunctions for every 2 conjunctions of Styx and Nix.

    https://en.wikipedia.org/wiki/Moons_of_Pluto#Resonances

    Although these are moons, these types of patterns are in evidence in at least some exoplanetary systems.

  5. tom0mason says:

    Out of all the planets in our solar system, ours is the only one with that blue-green glow of life.

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