L 98-59

The planetary system L 98-59 hosts at least 4 planets.

	System parameters
Primary system name	L 98-59
Alternative system names	TOI-175
Right ascension	08 10 08.00
Declination	-68 18 47.00
Distance [parsec]	10.62±0.03
Distance [lightyears]	34.65±0.10
Number of stars in system	1
Number of planets in system	4

Image

This artist's impression shows L 98-59b, one of the planets in the L 98-59 system 35 light-years away. The system contains four confirmed rocky planets with a potential fifth, the furthest from the star, being unconfirmed. In 2021, astronomers used data from the Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) instrument on ESO's VLT to measure the mass of L 98-59b, finding it to be half that of Venus. This makes it the lightest planet measured to date using the radial velocity technique. Credit: ESO/M. Kornmesser

Architecture of the system

This list shows all planetary and stellar components in the system. It gives a quick overview of the hierarchical architecture.

L 98-59, stellar object
- L 98-59 b, planet, semi-major axis: 0.0219±0.0008 AU
- L 98-59 c, planet, semi-major axis: 0.0304±0.0012 AU
- L 98-59 d, planet, semi-major axis: 0.0486±0.0019 AU
- L 98-59 e, planet, semi-major axis: 0.072+0.006−0.005 AU

Planets in the system

This table lists all planets in the system L 98-59.

	L 98-59 b	L 98-59 c	L 98-59 d	L 98-59 e
Alternative planet names	TOI-175 b	TOI-175 c	TOI-175 d	TOI-175 e
Description	In 2021, astronomers used data from the Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) instrument on ESO's VLT to measure the mass of L 98-59b, finding it to be half that of Venus. This makes it the lightest planet measured to date using the radial velocity technique. The parameters listed here were imported into the Open Exoplanet Catalogue from the exoplanet.eu website.	The parameters listed here were imported into the Open Exoplanet Catalogue from the exoplanet.eu website.	The parameters listed here were imported into the Open Exoplanet Catalogue from the exoplanet.eu website.	The parameters listed here were imported into the Open Exoplanet Catalogue from the exoplanet.eu website.
Lists	Confirmed planets
Mass [M_jup]	0.0013±0.0005	0.0070±0.0008	0.0061±0.0009	0.0096+0.0010−0.0012
Mass [M_earth]	0.41±0.16	2.2±0.3	1.9±0.3	3.1+0.3−0.4
Radius [R_jup]	0.076+0.006−0.004	0.124+0.008−0.007	0.136+0.011−0.009	N/A
Radius [R_earth]	0.85+0.06−0.04	1.38+0.10−0.07	1.52+0.12−0.10	N/A
Orbital period [days]	2.2531±0.0000	3.6907±0.0000	7.4507±0.0000	12.80±0.02
Semi-major axis [AU]	0.0219±0.0008	0.0304±0.0012	0.0486±0.0019	0.072+0.006−0.005
Eccentricity	0.10+0.12−0.04	0.10+0.04−0.06	0.07+0.06−0.05	0.13+0.11−0.08
Equilibrium temperature [K]	627±36	553±27	416±20	432+20−18
Discovery method	transit	transit	transit	RV
Discovery year	2018	2018	2018	2021
Last updated [yy/mm/dd]	21/08/06

Stars in the system

This table lists all stars in the system L 98-59.

	L 98-59
Alternative star names	TOI-175
Mass [M_Sun]	0.313±0.014
Radius [R_Sun]	0.312±0.014
Age [Gyr]	N/A
Metallicity [Fe/H]	-0.5±0.5
Temperature [K]	3367±150
Spectral type	N/A
Visual magnitude	11.70

Planet sizes

The following plot shows the approximate sizes of the planets in this system The Solar System planets are shown as a comparison. Note that unless the radius has been determined through a transit observation, this is only an approximation (see Lissauer et al. 2011b).

Habitable zone

The following plot shows the approximate location of the planets in this system with respect to the habitable zone (green) and the size of the star (red). This is only an estimate, using the star's spectral type and mass. Note that if no green band is shown in the plot, then the planet's orbit is far outside the habitable zone. The equations of Selsis, Kasting et al are used to draw the inner and outer boundaries.

Scientific references and contributors

Links to scientific papers and other data sources

http://simbad.u-strasbg.fr/simbad

http://exoplanet.eu

https://exoplanetarchive.ipac.caltech.edu

This table lists all links which are relevant to this particular system. Note that this is just a summary. More references to the scientific publications and comments can be found in the commit messages. To see these, head over the github or click here to directly go to the git blame output of this system. In the left column of the output you can see the commit message corresponding to each parameter. It also lists the date of the last commit and the person making the changes. Within the commit message, you will find a link to the scientific publication where the data is taken from. Note that this is a new feature and not all system parameters might have a reference associated with it yet. Please help making this catalogue better and contribute data or references!

Open Exoplanet Catalogue contributors

Contributor	E-mail	Number of commits
Hanno Rein	hanno(at)hanno-rein.de	5

This table lists all people who have contributed to the Open Exoplanet Catalogue. Please consider contributing! Click here to find out how. You can also view all commits contributing to this file on github.

Data download

You can download the xml file corresponding to this planetary system, which is part of the Open Exoplanet Catalogue. All information on this page has been directly generated from this XML file. You can also download the entire catalogue over at github. If you prefer to download the dataset as an ASCII tables, you might find the oec_tables repository useful.

Corrections

If you spot an error or if you can contribute additional data to this entry, please send an e-mail to exoplanet@hanno-rein.de. Please include the corrected xml file and a reference to where the new data is coming from, ideally a scientific paper. If you are fluent with git and github, you can also create a pull request or open an issue on the Open Exoplanet Catalogue repository. Please include the reference to the relevant scientific paper in your commit message.

Catalogue

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