Conférence virtuelle neutre en carbone à propos de : "Atelier Général du PNP"

Posters

Il y a un total de 2 posters.

Voir l'atmosphere des exoplanètes jeunes à moyenne resolution spectrale dans l'IR avec VLT/SINFONI
Flavien Kiefer - Lesia (Postdoc)
Poster 1

Spatially resolved spectra of imaged exoplanets in the near-IR can allow detecting chemical species, and directly constrain orbital and intrinsic parameters of the observed planet. With the medium resolving power of VLT/SINFONI in the K-band, absorption lines of simple molecules (such as H₂O and CO) in the atmosphere of young exoplanets are known to be detectable by cross-correlation with a theoretical planet model spectrum, a method known as Molecular Mapping. In practice, the exoplanet radiation is hidden below the point spread function (PSF) of the host star due to the optical setup, and it has to be removed beforehand in order to reveal the exoplanet. We developed a method that allows removing the stellar PSF and detecting the exoplanet atmosphere absorption spectrum without even using cross-correlation. This allowed us to directly characterise the atmospheric state (temperature, C/O, log(g), metallicity...) of Beta Pictoris b by matching its observed SINFONI spectrum to ExoREM theoretical models. We also obtained a new measurement of Beta Pic b's radial velocity, as well as its spin velocity, that respectively shift and broaden the molecular absorption lines. These results open perspectives of using the future medium-resolution infrared instruments (GRAVITY+, JWST/MIRI, ERIS+) to observe and characterise the atmosphere and spin of young spatially resolved exoplanets.

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Extended-body corrections to the inverse-square law for spherically symmetric sources
Mradumay Sadh - Nicolaus Copernicus Astronomical Center, Warsaw (PhD student)
Poster 2

The inverse-square law for calculating the irradiation arises as a direct consequence of the conservation of the energy, when spherical symmetry is imposed. The law implies that any spherically-symmetric source can be replaced, without changing the energy flux, by a point-sized source located in the center of symmetry. On the other hand, anybody who has seen a sunset knows that, when the center of the Sun moves slightly below the horizon, still a considerable portion of the stellar surface can be visible, irradiating much more than the corresponding point-sized source, which would be hidden under the horizon. This apparent contradiction is immediately solved when one realizes that the presence of the planet, whose surface is absorbing part of the photon flux coming from the star, breaks the spherical symmetry, producing violations of the inverse-square in the sunset (or, equivalently, sunrise) region. On exoplanets that are extremely close to their star, this breakdown of the inverse-square law can become very important. In the present paper we calculate the total irradiance from the star by explicitly integrating the irradiance from each surface element of the stellar surface visible from a given latitude on the planet. We assume that the stellar limb darkening can be approximated using a linear law in our calculations. We find that the difference in the irradiation calculated by our model and the inverse-square law is significant at the polar regions of the exoplanets. We also find that, as a consequence of the geometry of the star, the day-night terminator shifts from poles towards the night side of the exoplanet. sunrise) region.

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Learn how to interact with posters

Step 0
Important
Step 1
Overview
Step 2
View a poster
Step 3
Ask a question
Step 4
Video call
Step 5
For poster's owners

Important

It is recommended that you read all information here at least once before seeing posters!

Note that you can always come back here by clicking on this button Read the poster's guide at the top of the web page once the guide is closed.

First you have to create an account on CarbonFreeConf that you will be able to use for other conferences later. If you do not and that organizers allow everyone to see posters, you may be able to view posters but not ask questions or upvote them. To register on CarbonFreeConf, click the sign-up button Sign-up when you close this guide (or sign-in directly using your login and password if you have already signed-up in the past, even if it was for another CarbonFreeConf-erence).

Overview

Go to the poster page to access all posters validated by organizers

Once accepted the posters become visible (when organizers have decided so). There may be a delay between acceptance and upload of the poster by the participants. In this case you will see the poster's abstracts (click READ MORE if the abstract is shortened) but not its content.

When two or more posters are uploaded, you can see the View random poster? link appear, which you can click to discover posters at random.

You can also upvote posters if you like them and ask questions to (or even call) poster's presenters as will be described in the next steps.

If you are looking for a specific poster, use the search bar at the top to look through all posters by title, content or speaker's name.

If you have a poster of your own, you may want to check the last section of this guide urgently!

View a poster

Organizers can decide whether posters are public or only accessible to participants. In case of public access, make sure to log-in anyway to have access to all functionalities when viewing posters.

To see a poster, nothing easier: click 'Poster' in the top menu and you will see all accepted posters in the session.

Then look through the posters and if you see written 'The author is still working on their poster', it means that they have not uploaded their pdf or recording yet. Otherwise you will see a mini-image (thumbnail) of the poster (if a pdf has already been uploaded) or 'Check out the poster's video' (if only a recording was uploaded and no pdf file).

You can then click on the thumbnail of the poster or Check out the poster's video to see the actual poster. It will open a foreground window in which the poster and/or poster's recording appears. Indeed, poster recordings are sometimes added by participants to directly explain their poster in a video.

You can upvote posters: To upvote a poster, open it and then under the poster (or the video recording) you will see the 'Total number of upvotes' for this poster and a thumb up symbol below. Click on the thumb up to give one more vote to the poster. You are only given 3 votes for one given conference so use them wisely. Note that your vote cannot be changed after the fact. The organizers can see the posters that rank higher and may decide to give them an official or unofficial prize.

Ask a question

Curious about the poster? Then ask a question to the poster's maker.

When you have opened a poster, you can see at the bottom (if you are logged-in) that a chat room is accessible. You can write your question there as this room is dedicated to the poster you are visiting.

Do not hesitate to tag the poster's maker at the end of your question by pre-typing @ and then the participant's last name and you will see a drop down list from which you can just pick the right person. This will ensure the poster owners get notified of the question immediately and reply quickly (they may and should have activated notifications on their poster's channel anyway but it is safer to tag them in case they did not).

Poster presenters sometimes add some videos and/or vocal recordings directly in their channel (look for it through past messages).

Note that once you have visited a poster, it is added to your private group list in the chat area and you can easily go back to the question area from the chat without going through the poster page again. If you do not see the poster's channel in your list of channels on the left hand side of the chat area, use the top search bar (that opens after clicking the magnifying glass symbol) and type the name of the poster's presenter to find the right channel (you can even add the channel to your favourites if you often access it).

If you have a private question that you do not wish to share publicly, use the button below the mini-image of the poster (thumbnail) and then type in your message that will be sent via email to the poster's maker.

Video call with the poster's presenter

You can make a video call with the poster's maker if you wish to talk to them.

To call the poster's presenters, go to their poster chat rooms and then push the 'phone' button at the top right of the room. A video call will then be started and will be accessible to participants visiting the room (after they click: join the call). If the poster's presenter is not present in the video call, contact them ahead (either directly in the room or via private message) and arrange for a time to meet and try again.

The virtual room offers many options (e.g. share screen) to make the experience smoother and interactive. Go try it now! Note that this option is available everywhere, not just in poster's rooms.

For poster's owners

A few tips and tricks for poster's owners

First, go check your poster yourself as if you were a random participant and verify that everything is what you expected.

Second, go to the chat area (below the poster) and you can add a message saying that you are around to answer questions. You can also easily add a vocal recording in the chat area by pushing the microphone button or even add a video by pushing the plus button and then 'video message'. There are many options that you can play with.

Third, you should activate the notifications in your poster's channel to be sure to know when other participants ask questions. To do so, click the 3 vertical dots at the top right of the room and select 'notification preferences'. Then make your own set-up, whether you want to be contacted via email, be notified on your screen or via a sound, ... (you should change the default option to something else as default means 'do nothing' in our case).

Fourth, go check regularly your poster's channel to make sure you do not miss any comments and tag participants when you reply to them so that they are notified.

Fifth, you have the option to click on the phone at the top right of your room to open a video call and talk to other participants. If you do so, you may want to warn others in advance (e.g. in the chat room directly) so that they do not miss you and can ask live questions.

Sixth, you can add files to your channel if needed with a simple drag-and-drop or by clicking the plus button at the bottom left of the chat room and selecting 'add a file from my computer'.

Seventh, you can see who consulted your poster by clicking on the 'member' button at the top right of your chat room and contact them from there if needed.

Eight, you can explore all the options as there are many not described here (e.g. pin a message, ...).