Unknown Facts About Exoplanets

[caballerodiez]

Hi!

If you are interested in exoplanets, you might want to know these little known facts about exoplanets.

Source: https://www.youtube.com/watch?v=In2DjQQ1oyc

1. In our stellar neighborhood there might be around 130 potentially (p.) habitable exoplanets, 10 of them being Earth-like.
2. The closest p. Earth-like planet is called Tau Ceti e, and it is located only 12 light years away from us.
3. So far, we have sent a targeted radio message to 2 p. habitable exoplanets, Tau Ceti e and Luyten b. Any reply would be received as of 2037 and 2041, respectively.
4. Amateur astronomers have discovered 2 p. habitable exoplanets: LHS-1140 b and K2-288 B b.
5. It is possible to detect exoplanets by using a tele-photo lens with an aperture of less than 50 mm.

Hope you learnt something knew!

[Geonovast]

Moving to Science & Spaceflight.

[DDE]

38 minutes ago, caballerodiez said:

Earth-like

*groan*

They're super-Earths, and the more we look at them, the less they look like Earth.

[Shpaget]

7 hours ago, caballerodiez said:

It is possible to detect exoplanets by using a tele-photo lens with an aperture of less than 50 mm.

This does not compute.

[cubinator]

6 minutes ago, Shpaget said:

This does not compute.

Maybe with spectroscopy on transiting planets only?

7 hours ago, DDE said:

*groan*

They're super-Earths, and the more we look at them, the less they look like Earth.

At least we have two about the same size as Earth in Teegarden's system.

[Shpaget]

Hmm, haven't thought of that, but 50 mm won't get you much resolution, even with diffraction limited optics.

Anyway, the "less than 50 mm " is weird way to put it, since 2 mm aperture is less than 50, and would be useless for the purpose.

[kerbiloid]

What they call Earth-like, is probably either a Superearth as said above, or a teenager Venus.

Edited September 28, 2019 by kerbiloid

[UmbralRaptor]

Note that for our purposes, Venus and Mars are "Earthlike", so be careful not to take "habitable" too literally.

10 hours ago, Shpaget said:

This does not compute.

You might think so, but it totally works for KELT. WASP and TESS aren't *that* much bigger, also.

[caballerodiez]

2 hours ago, UmbralRaptor said:

Note that for our purposes, Venus and Mars are "Earthlike", so be careful not to take "habitable" too literally.

You might think so, but it totally works for KELT. WASP and TESS aren't *that* much bigger, also.

True.  TESS lenses have an aperture of just 100mm (4 inches).

Edited September 28, 2019 by caballerodiez

[kerbiloid]

So, we should just call them "Venus-like" planets, as probably only rarely one of the Venuses mutate into the Earth.

[DDE]

9 hours ago, kerbiloid said:

So, we should just call them "Venus-like" planets, as probably only rarely one of the Venuses mutate into the Earth.

My - likely obsolete - understanding is that the real Goldilocks allows carbon sequestering into limestone, while sufficiency size and an active dynamo prevent all-around atmospheric loss.

[kerbiloid]

5 minutes ago, DDE said:

active dynamo

From where without a starter?

How many rocky bodies with dynamo do we know?

Edited September 29, 2019 by kerbiloid

[LaydeeDem]

On 9/28/2019 at 2:49 AM, Shpaget said:

Hmm, haven't thought of that, but 50 mm won't get you much resolution, even with diffraction limited optics.

Anyway, the "less than 50 mm " is weird way to put it, since 2 mm aperture is less than 50, and would be useless for the purpose.

very few exoplanets are found through direct imaging. producing a lightcurve doesn't necessarily require a lot of aperture

Edited October 1, 2019 by LaydeeDem